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Medical Dictionary: p

p waveMarks atrial depolarization. In a normal EKG, it precedes the QRS complex.Cardiovascular
p.c.after meals needed
PAPhysician Assistant
PACpremature atrial contractioncardiovascular
pacemakerA device designed to use electric impulses to simulate heart contractions.Cardiovascular
Paco2partial pressure of carbon dioxide in alveolar gasrespiratory
PADperipheral arterial disease cardiovascular
PAFplatelet activating factorcardiovascular
painAn unpleasant or distressing localized sensation induced by noxious stimuli which are detected by nerve endings of nociceptive neurons. Nervous
palateThe structure that forms the roof of the mouth. It consists of the anterior hard palate and the posterior soft palate. Skeletal
pale/oearly, primitive, oldgeneral
palliative medicineA branch of medicine concerned with preventing and relieving the suffering of patients in any stage of disease and improving the quality of the patient's life. General
pallorA clinical manifestation consisting of an unnatural paleness of the skin. Integumentary
palpationUse of fingers with light pressure as part of a physical exam.Cardiovascular
palpebr/oeyelideyes and ears
PALSpediatric advanced life support cardiovascular
pancreasAn irregularly shaped gland, located behind the stomach, that secretes pancreatic juice into the duodenum and insulin, glucagon, and somatostatin into the bloodstream.Digestive
pancreatectomyRemoval of the pancreas. Digestive
pancreatitisInflammation in the pancreas. endocrine
pandemicA widespread epidemic of infectious disease.General
panicA state of extreme acute, intense anxiety and unreasoning fear.Nervous
panic attackFear response that is out of proportion for the situation.nervous
panniculitisGeneral term for inflammation of adipose tissue, usually of the skin, characterized by reddened subcutaneous nodules. Integumentary
pant/owhole, allgeneral
panuveitisInflammation of both the anterior and posterior segments of the uvea tract. Eyes And Ears
PapPap test Papanicolaou smear reproductive
papill/onipple, optic discgeneral
papillaA small, nipple-like projection.General
papilledemaSwelling of the optic disk due to increased intracranial pressure.eyes and ears
papillomaA benign epithelial tumor derived from epithelium and projecting from the surrounding surfaceIntegumentary
papul/opapule, pimpleintegumentary
papuleA solid raised lesion that has distinct borders and is less than 1 cm in diameter.integumentary
-parato bear offspringreproductive
para-similar, besidegeneral
paradoxA statement, finding or condition, that, despite apparently sound reasoning from true premises, leads to a self-contradictory or a logically unacceptable conclusion.General
paraffinA mixture of solid hydrocarbons obtained from petroleum.General
paragangliomaA neoplasm derived of the tissue composing the paraganglia.General
paralysisLoss of muscle function.muscular
paramedicalPertaining to certain adjunctive healthcare professions, particularly trained emergency responders.General
parametritisInflammation of the parametrium, the connective tissue of the pelvic floor.General
parametriumThe lateral extension of the uterine connective tissue into the broad ligament. General
paranasal sinusesAir-filled cavities located around the nasal cavity. There are four pairs: frontal, sphenoid, maxillary and ethmoid. Respiratory
paranoiaOverly suspicious behavior.Nervous
paranoid behaviorBehavior exhibited by individuals who are overly suspicious, but without the symptoms characteristic of paranoid personality disorder or schizophrenia. Nervous
paranoid disordersChronic mental disorders in which there has been an insidious development of a permanent and unshakeable delusional system, but with clear and orderly thinking. Emotional responses and behavior are consistent with the delusional state. Nervous
paraparesisWeakness or partial paralysis of the lower extremities.General
paraphasiaA condition in which the patient uses wrong words, creating unintelligible sentences.General
paraphimosisA condition in which the foreskin, once retracted, cannot return to its original position. If this condition persists, it can lead to painful constriction of glans penis, swelling, and impaired blood flow to the penis. Reproductive
paraplegiaParalysis affecting the legs.muscular
parasiteInvertebrate organisms that live on or in another organism.lymphatic
parasomniaAny of a group of sleep disorders characterized by unwanted behaviors or perceptions that occur during sleep or partial arousal from sleep, including sleepwalking, night terrors, and frequent nightmares.General
paratenonThe fatty or synovial tissue between a tendon and its sheath.Skeletal
parathyroid glandsTwo pairs of small oval-shaped glands located in the front and the base of the Neck and adjacent to the two lobes of thyroid gland. they secrete parathyroid hormone that regulates the balance of calcium; phosphorus; and magnesium in the body. General
parathyroidectomySurgical removal of one or more parathyroid glands.endocrine
paresisA general term referring to slight or incomplete paralysis.General
-paresisweakness, slight paralysisnervous
paresthesiaA sensation of tingling or numbness, skin crawling, or itching without apparent cause.nervous
parietal boneOne of a pair of irregularly shaped quadrilateral bones situated between the frontal bone and occipital bone, which together form the sides of the cranium. Skeletal
parietal lobeUpper central part of the cerebral hemisphere. It is located posterior to central sulcus, anterior to the occipital lobe, and superior to the temporal lobes. Nervous
parityThe number of viable offspring a female has borne.Reproductive
Parkinson diseaseA progressive disease of the nervous system that affects movement.nervous
paronychiaAn infection of the skin around a fingernail or toenail. integumentary
parotid glandEither of the pair of salivary glands that lie on the sides of the face immediately below and in front of the ear. Digestive
parotitisInflammation of the parotid gland. Digestive
paroxysmA spasm or convulsion.General
paroxysmal supraventricular tachycardiaA very rapid heartbeat that occurs sporadically. Usually lasts from a few seconds to several hours.Cardiovascular
parturitionThe act of giving birth to one or more offspring. Reproductive
pasteurizationHeating of certain beverages, such as milk, to a specific temperature for a fixed time interval in order to kill microorganisms.General
PATparoxysmal atrial tachycardiacardiovascular
patellaThe flat, triangular bone about 5 cm in diameter, situated at the anterior part of the knee. Also called the kneecap.Skeletal
pathogenA disease causing microorganism such as bacterium, virus or fungus.General
pathologic processesThe abnormal mechanisms and forms involved in the dysfunctions of tissues and organs. General
pathologicalPertaining to or caused by disease.General
pathologyA medical specialty concerned with the nature of disease and its causes, processes, development, and consequences.General
patulousOpen or exposed.General
Pblead general
PCApatient-controlled analgesia
PDParkinson diseasenervous
PD (2)pupillary distance Eyes And Ears
PDApatent ductus arteriosus cardiovascular
PDRPhysicians' Desk Reference
PEphysical examination
PE (2)pulmonary embolism respiratory
PEApulseless electrical activitycardiovascular
peak flow meterSimple device that allows asthma patients to check lung airflow.Respiratory
pectenThe middle, narrow zone in the anal canal.Digestive
pectoralRelating to the thorax.Muscular
pectus carinatumThe chest or breast.Muscular
ped/ochild, footGeneral
pediatricsA medical specialty concerned with maintaining health and providing medical care to children from birth to adolescence. General
pediculosisHead lice.integumentary
pedophiliaAn adult abnormal attraction to children for sexual purposes.General
peduncleA stalk like structure that serves as a support or connection.General
PEEPpositive end expiratory pressure respiratory
PEFRpeak expiratory flow rate respiratory
PEGpercutaneous endoscopic gastrostomy digestive
pellagraA disease characterized by scaly dermatitis, diarrhea and dementia caused by a deficiency of niacin and protein in the diet.Digestive
pellicleA thin skin, film or organic membrane General
pelvic floorThe connective tissues and muscles that lie beneath and support the perineum and pelvis. It extends between the pubic bone anteriorly and the coccyx posteriorly. Muscular
pelvisThe lower portion of the trunk, bounded anteriorly and laterally by the two hip bones and posteriorly by the sacrum and coccyx.Skeletal
pemphigusAny of several rare diseases characterized by groups of itching blisters. Integumentary
penicillinAny of a group of antibiotics derived from cultures of the mold like fungi Penicillium or produced synthetically.General
penisThe external reproductive organ of males. Reproductive
peptic ulcerUlcer that occurs in the regions of the gastrointestinal tract which come into contact with gastric juice.digestive
peptidesMembers of the class of compounds composed of amino acids joined together by peptide bonds between adjacent amino acids into linear, branched or cyclical structures. General
perceptionThe process by which the nature and meaning of sensory stimuli are recognized and interpreted. General
percussionAct of striking a part with short, sharp taps in diagnosing the condition beneath the sound obtained. General
percutaneousThrough the skin.General
perforationAbnormal opening in a hollow organ or viscus. General
performance anxietyAnxiety related to the execution of a task, especially with an audience.General
perfusionDelivery of blood to the capillaries.Cardiovascular
peri-around, surroundingdirectional
periapicalAround an apex, especially the apex of a root of a tooth.General
periarthritisInflammation of the tissues around a joint capsule.Skeletal
pericardial effusionFluid accumulation within the pericardium. Severe cases can lead to cardiac tamponade. Cardiovascular
pericardial fluidWatery fluid produced in the serous and visceral pericardium surrounding the surface of the heart Cardiovascular
pericardial friction rubAn extra heart sound that resembles squeaky leather. May be heard in pericarditis.Cardiovascular
pericardiocentesisPuncture and aspiration of fluid from the pericardium. Cardiovascular
pericarditisInflammation of the pericardium, caused by infection, injury, or drugs.Cardiovascular
pericardiumA thin layered sac enclosing the heart. Fluid between the layers lubricates the constantly moving surfaces.Cardiovascular
pericoronitisInflammation of the gingiva surrounding the crown of a tooth. General
perihepatitisInflammation of the peritoneal capsule of the liverDigestive
perimenopauseThe period of time before menopause when a woman's body changes.reproductive
perimetritisInflammation of the peritoneal covering of the uterusReproductive
perinatalPertaining to the period three months before to one month after birth.Reproductive
perine/operineum (surface region in both males and females between the pubic symphysis and the coccyx)reproductive
perinephritisInflammation of the connective and adipose tissues surrounding the KIDNEY. Urinary
perineumThe body region lying between the genital area and the anus on the surface of the trunk, and to the shallow compartment lying deep to this area that is inferior to the pelvic diaphragm. The surface area is between the vulva and the anus in the female, and between the scrotum and the anus in the male. General
periodontalAround a tooth.General
periodonticsA dental specialty concerned with the histology, physiology, and pathology of the tissues that support, attach, and surround the teeth, and of the treatment and prevention of disease affecting these tissues. General
periodontitisInflammation and loss of connective tissues supporting or surrounding the teeth. General
periorbital edemaA condition in which the tissues around the eyes become swollen. Puffy eyes.eyes and ears
periosteumThick, fibrous membrane covering the surface of a bone except its articular cartilage and areas where it attaches to tendons and ligaments.Skeletal
periostitisInflammation of the periosteum. Skeletal
peripartum periodThe period shortly before, during, and immediately after giving birth. Reproductive
peripheral neuropathyDysfunction of peripheral nerves which can impair movement, sensation and organ function. nervous
periphlebitisInflammation of the tissues around a veinCardiovascular
peristalsisA movement, caused by sequential muscle contraction, that pushes the contents of the intestines or other tubular organs in one direction. Digestive
peritone/operitoneum (serous membrane lining the abdominal cavity)digestive
peritoneal absorptionUptake of substances from the peritoneal cavity. Digestive
peritoneal cavityThe space enclosed by the peritoneum. It is divided into two portions, the greater sac and the lesser sac or omental bursa, which lies behind the STOMACH. The two sacs are connected by the foramen of Winslow, or epiploic foramen. Digestive
peritoneal dialysisDialysis fluid being introduced into and removed from the peritoneal cavity.urinary
peritoneumThe serous membrane that lines the walls of the abdominal cavity and folds inward to enclose the viscera. General
peritonitisInflammation of the peritoneum lining the abdominal cavity as the result of infectious, autoimmune, or chemical processes. General
perlecheFissures and cracks at the corner of the mouthIntegumentary
permeabilityProperty of membranes and other structures to permit the passage of substances, heat and light.General
perniciousDiseases that are highly dangerous or fatal.General
pernicious anemiaVitamin B12 deficiency anemia. A type of megaloblastic anemia.Cardiovascular
peronealPertaining to the fibula.General
PERRLApupils equal, regular, react to light and accommodationEyes And Ears
pertussisWhooping cough. Contagious bacterial infection of the upper respiratory tract. Cold-like symptoms followed by many weeks of coughing. Preventable with immunization.Respiratory
pest/ipests, plaguegeneral
pesticideA substance used to destroy pests.General
PETpositron emission tomography General
-petalmoving forwardgeneral
petechiaA small, round, dark-red spot caused by intradermal or submucous hemorrhage.Integumentary
petechiaeTiny flat round red spots under the skin surface caused by intradermal hemorrhage. Spots do NOT blanch with pressure.integumentary
petr/ostone, stone-like hardnessskeletal
-pexysurgical fixationurinary
Peyronie diseaseA condition where plaques form under the skin of the penis, causing the penis to bend.reproductive
PFTpulmonary function test Respiratory
PHpast medical history General
phac/opertaining to lenseyes and ears
phag/oeat, swallowlymphatic
-phagiaeating, swallowingdigestive
phagocytosisThe engulfing and degradation of microorganisms.General
-phagyeating, devouringgeneral
phak/opertaining to lenseyes and ears
phalangesFingers or toesgeneral
phalangitisInflammation of a finger or toe.Skeletal
phantom limbPhantom sensations that occur following the complete or partial loss of a limb. Nervous
pharmacologyThe study of the origin, nature, properties, and actions of drugs and their effects on living organisms. General
pharmacyThe art and the facility for the preparation and dispensing of drugs. General
pharyngealOf, or pertaining to, or coming from the pharynx.General
pharyngitisSore throat. Inflammation of the throat. Respiratory
pharynxThe throat. A fibromuscular tube that conducts air to the larynx and lungs and food to the esophagus.Respiratory
phenolA strong disinfectant.General
phenotypeThe outward appearance of the individual.General
phenylketonuriaAny of a group of autosomal recessive disorders of the ability to metabolize phenylalanine.General
pheromonesChemical substances, excreted by an organism into the environment, that elicit behavioral or physiological responses from other organisms of the same species. General
-philiaaffinity forcardiovascular
phimosisA condition of a narrowed or tightened foreskin that cannot be retracted to reveal the glans penis.Reproductive
phlebitisInflammation of a vein, commonly a vein in the leg. Cardiovascular
phlebographyAn invasive imaging study of leg veins with a contrast agent injects using a catheter. Phlebography is the most accurate test for detecting deep vein thrombosis.Cardiovascular
phlebotomyThe techniques used to draw blood from a vein for diagnostic purposes.Cardiovascular
phlegmMucus in the respiratory airways (trachea, bronchial tree).Respiratory
phob/ofear, adversionNervous
-phobiaabnormal fearnervous
phon/osound, voicerespiratory
phonationTo vocalize.Respiratory
phonocardiogramA waveform of heart sound amplitude over time, usually a few heartbeats.Cardiovascular
phor/oto carrygeneral
-phorecarrier, processorGeneral
phot/olighteyes and ears
photalgiaPain in the eye causes by bright light.Eyes And Ears
photophobiaAbnormal sensitivity to light.eyes and ears
photoreceptor cellsSpecialized cells that detect and transduce light. General
photoretinitisInjury to the retina of the eye caused by looking directly into the sun without protection.Eyes And Ears
photosynthesisThe synthesis by organisms of organic compounds, especially carbohydrates, from carbon dioxide using energy obtained from light .General
phototherapyTreatment of disease by exposure to light, especially by specific wavelengths. General
phototrophicCapable of deriving energy from light.General
phreni-diaphragm, mindrespiratory
phrenicPertaining to the diaphragm.General
phyl/orace, species, typegeneral
physi-physical, naturalgeneral
physiatristA doctor specializing in the physiological treatment of patients with conditions affecting movement. Often used in stroke rehabilitation.muscular
physical examinationSystematic and thorough inspection of the patient for physical signs of disease or abnormality. General
physiciansIndividuals licensed to practice medicine. General
-physisgrowth, growingSkeletal
physo-swelling, gasgeneral
PIpresent illness; previous illness
pico-one trillionthgeneral
PIDpelvic inflammatory disease reproductive
pigmentationColoration or discoloration of a part by a pigment. General
PIHpregnancy-induced hypertension reproductive
piloerectionThe standing up of hairs on the skin Integumentary
pilonidal sinusA hair-containing cyst or sinus, occurring chiefly in the coccygeal region. Integumentary
pineal glandA light-sensitive neuroendocrine organ attached to the roof of the Third ventricle of the brain. the pineal gland secretes melatonin, other biogenic amines and neuropeptides. General
pintaA contagious bacterial skin disease prevalent in tropical America.Integumentary
PIPproximal interphalangeal skeletal
pituitary adenomaBenign epithelia neoplasm of the pituitary.endocrine
pituitary glandA small, oval, unpaired, endocrine gland connected to the hypothalamus by a short stalk which is called the infundibulum. Its secretions control the other endocrine glands and influence growth, metabolism, and maturation.Endocrine
pityriasisAny of a group of skin diseases characterized by the formation of fine, branny scales. This term is but only with a modifier.Integumentary
PKUphenylketonuria urinary
placeboAny dummy medication or treatment. General
placentaA vascular organ that develops during pregnancy, lining the uterine wall and partially enveloping the fetus. The placenta produces an array of steroid, protein and peptide hormones . Reproductive
placenta previaA condition when the placenta covers part or all of the cervix during the last months of pregnancy.reproductive
plagiocephalyThe condition characterized an irregular shape of the head often in parallelogram shape with a flat spot on the back or one side of the head. Skeletal
plagueAn infectious disease transmitted by the bite of a flea from a rodent infected with the bacillus Yersinia pestis.General
plan/oflat, plan, levelgeneral
plani-flat, levelgeneral
plantarBottom of the footskeletal
plantar fasciitisIrritation of the connective tissue that runs from the heel to the base of the toes. Also known as :postman's heel".muscular
plaqueFatty deposits formed on the walls of arteries. Cardiovascular
plasmaThe part of blood which is not blood cells. Blood plasma also contains glucose and other dissolved nutrients. It also helps blood clot.Cardiovascular
plasmacytomaAny discrete, presumably solitary, mass of neoplastic plasma cells either in bone marrow or various extramedullary sites. General
plasmapheresisProcedure whereby plasma is separated and extracted and the red cells returned to the donor.General
-plastysurgical repairgeneral
plateletsPart of blood that help stop bleeding by clumping and clotting blood vessel injuries.Cardiovascular
platy-broad, flatgeneral
platybasiaA malformation of the cranium so that the floor of the posterior cranial fossa bulges upward in the region about the foramen magnum.Skeletal
pledgetA small compress used to medicate, protect, or absorb drainage from a woundGeneral
pleocytosisA presence of an abnormally high number of cells in the cerebrospinal fluid.Cardiovascular
pless/istriking, percussiongeneral
pleur/opleura, ribrespiratory
pleuraThe membrane enveloping the lungs consisting of two layers. The visceral pleura is attached directly to the lungs. The outer parietal pleura lines the thoracic cavity and diaphragm. Between the two layers is the pleural cavity, containing a lubricating liquid film. Respiratory
pleural effusionExcessive fluid in the pleural cavity which may cause breathlessness.Respiratory
pleural friction rubSound created by the rubbing of when the chest wall moves. Stops when patient holds her breath. Often heard with pleurisy. Thick inflamed surfaces sliding by one another.Respiratory
pleurisyInflammation of the pleura, the membranes covering the lungs. Respiratory
pleurodyniaInflamed lung membranes causing pain during inhalation. Respiratory
plexusA network of nerves or blood vessels.General
pluri-several, moregeneral
PMafternoon, evening general
PMHpast medical history general
PMNpolymorphonuclear (neutrophil leukocyte)cardiovascular
PMSpremenstrual syndrome reproductive
PNDparoxysmal nocturnal dyspnea respiratory
pneo-air, breath, breathingrespiratory
pneum/olung, airrespiratory
pneumocephalusPresence of air or gas within the intracranial cavity usually the result of a fracture.General
pneumoconiosisOccupational lung disease caused by prolonged inhalation of dust. Common lung disease in mining. Respiratory
pneumocyteAny of the epithelial cells lining the alveoli of the lung.Respiratory
pneumonectomySurgical removal of part or all of a lung. Respiratory
pneumoniaInflammation of the lungs with alveoli filling with pus. Typically caused by infection and can follow flu, colds and other illnesses.Respiratory
pneumonitisInflammation of lung tissue.Respiratory
pneumoperitoneumPresence of air or gas in the peritoneal cavity.Respiratory
pneumorrhachisPresence of air or gas within the spinal canal cavity.General
pneumothoraxPartial or fully collapsed lung. An accumulation of air in the pleural cavity. Caused by trauma, such as a gun shot or stab wound and can also occur spontaneously.Respiratory
PNHparoxysmal nocturnal hemoglobinuria cardiovascular
PNIperipheral nerve injurynervous
PNSperipheral nervous system nervous
podiatryA medical specialty concerned with the diagnosis and treatment of foot disorders and injuries. General
-poiesisproduction, formationgeneral
poikil-irregular, variedgeneral
poisonA substance capable of damaging the structure or function of the body.General
poliomyelitisA highly infectious viral disease that involves the gray matter of the spinal cord, leading to paralysis, muscular atrophy, and deformity.General
polyarthritisSimultaneous inflammation of several joints.Skeletal
polychondritisInflammation of cartilage.Skeletal
polycystic kidney diseaseAn inherited disease in which cysts develop within the kidneys.urinary
polycystic ovary syndromeA condition in which a woman’s levels of the sex hormones estrogen and progesterone are out of balance. Often cause for infertilityreproductive
polycythemiaAbnormal increase in the aggregate red cell mass of the blood. Cardiovascular
polydactylyA congenital anomaly of the hand or foot, characterized by supernumerary digits. Skeletal
polydipsiaExcessive thirst. endocrine
polymorphismOccurring in several different forms.General
polymyositisInflammation of the muscles or associated tissues, such as the blood vessels that supply the musclesmuscular
polyneuropathyA disease of multiple peripheral nerves simultaneously. Nervous
polypAbnormal tissue mass that protrudes into the lumen of the digestive or respiratory tracts. digestive
polyphagiaExcessive hunger or appetite.endocrine
polypsDiscrete abnormal tissue masses that protrude into the lumen of the digestive tract or the respiratory tract. Digestive
polysomnographySleep study. Includes monitoring of respiratory patterns, brain waves, sleep stages, and other physiological variables. Respiratory
polyuriaExcessive production of urine.urinary
pono-fatigue, exhaustion, overworkgeneral
ponsThe front part of the hindbrain that lies between the medulla and the midbrain ventral to the cerebellum, serving as a relay station for neural pathways. Nervous
poplitealPertaining to the area behind the knee.Skeletal
por/opassage, opening, ductgeneral
porokeratosisA rare, chronic, progressive autosomal dominant skin disorder market by craterlike patches.Integumentary
poroma A neoplasm of cells lining the skin openings of sweat glands.Integumentary
-porosisdecrease in densitySkeletal
portal veinA vein that conducts blood from the digestive organs, spleen, pancreas, and gallbladder to the liver.Digestive
-posiadrinking, fluid intakedigestive
possetA small amount of milk that is regurgitated by infants after feeding.Reproductive
post-after, behind, backdirectional
post-traumatic stress disorderA disorder that develops in people who have experienced a terrifying event.nervous
post.posterior directional
postmenopauseThe physiological period following the menopause.Reproductive
postpartumThe period that is shortly after giving birth.Reproductive
postprandialAfter a meal.Digestive
postureThe position of the body. Skeletal
ppmparts per million
PRthrough the rectum
-praxiato perform, actionnervous
PRBCpacked red blood cells cardiovascular
pre-before, in front ofdirectional
prebioticsIndigestible food ingredients that promote overall health by supporting the activity of probiotic bacteria in the large intestine.Digestive
precordiumThe region of the thorax immediately over the heart.Skeletal
prediabetesA condition in which blood glucose levels are higher than normal. Considered a warning sign for diabetes.endocrine
prediabeticThe time period before the development of symptomatic diabetes mellitus. General
preeclampsiaA serious pregnancy disorder characterized by high blood pressure, a large amount of protein in the urine and edema of hands and feet.reproductive
pregnancyCarrying developing offspring (embryos or fetuses) in utero before birth.Reproductive
preleukemiaConditions in which the abnormalities in the peripheral blood or bone marrow represent the early manifestations of acute leukemia, but in which the changes are not of sufficient magnitude or specificity to permit a diagnosis of acute leukemia by the usual clinical criteria. Lymphatic
premature ejaculationThe emission of semen and seminal fluid during the act of preparation for sexual intercourse, i.e. before there is penetration, or shortly after penetration. Reproductive
premedicationPreliminary administration of a drug preceding a diagnostic, therapeutic, or surgical procedure. General
premenopauseThe period before menopause. The transition from full sexual maturity to cessation of ovarian cycle takes place between the age of late thirty and early fifty. Reproductive
preneoplasticPreceding the formation of a tumor.General
prepuceThe fold of skin that grows over the end of the penis.Reproductive
presby/oold agecardiovascular
presbycusisHearing loss that gradually occurs in most individuals as they grow older.eyes and ears
presbyopiaAn age-related condition when the eye's lens doesn't change shape as easily as it once dideyes and ears
pressure ulcerAn ulcer that appears in the skin over a bony prominence due to compression and inadequate blood perfusion. Bedridden or chair bound patients are at risk. Also called bedsore.Integumentary
prevalenceA measure of morbidity based on currents levels of a disease in a population.General
priapismA abnormally prolonged erection of the penis.reproductive
primigravidaA woman who is pregnant for the first time.reproductive
primiparaA woman who has given birth to one viable infant.Reproductive
prionA small infectious protein particle causing neurodegenerative diseases including Creutzfeldt-Jakob syndrome.General
pro-before, in front ofgeneral
probabilityThe likelihood that an event will occur. General
proct/oanus and rectumdigestive
proctocolitisInflammation of the rectum and the colon. Digestive
proctoscopeEndoscope for examination of the rectum and anus. Digestive
prodromeAn early symptom that precedes the onset of disease. General
profundaBlood vessels situated deep in the body tissues they supply.Cardiovascular
progeriaAn abnormal congenital condition of premature aging.General
progesteroneA sex hormone produced by the ovaries.endocrine
prognosisA prediction of a outcome of a disease.general
projectionA defense mechanism, operating unconsciously, whereby that which is emotionally unacceptable in the self is rejected and attributed (projected) to others. Also called the blaming mechanism.General
prokaryoteA unicellular organism lacking a true nucleus and nuclear membrane, having genetic material consisting of a single molecule of double-stranded DNA. General
prolactinA pituitary hormone that stimulates and maintains lactation in postpartum mammals.Reproductive
prolactinomaA begin tumor of the pituitary gland overproduces a hormone called prolactin.endocrine
prolapseThe protrusion or sinking down of an organ or part of an organ.General
promontoryA projecting part.General
pronationThe inward roll of the foot (medial malleolus) while walking or running.muscular
proneLying on the abdomendirectional
prone positionThe posture of an individual lying face down. General
proptosisProtrusion or bulging of the eye.Eyes And Ears
pros/oforward, anteriordirectional
prospective studyA forward looking study of a group over a long period.General
prostateA gland that is part of a male reproductive system. Located below the bladder.reproductive
prostatic neoplasmsTumors or cancer of the prostate. General
prostatismLower urinary tract symptom, such as slow urinary stream, associated with prostatic hyperplasia in older men. Urinary
prostatitisInflammation of the prostate gland.Urinary
prosthesisA device that replaces a missing body part or makes a part of the body work better. skeletal
proteinA large molecule consisting of a long chain or sequence of amino acids that is an essential constituent of the body.General
proteinuriaThe presence of proteins in the urine, an indicator of kidney diseases. General
proteolysisThe decomposition of proteins into peptides and amino acids by enzymes in the digestive tract.Digestive
protoplasmThe living contents of a cellGeneral
protozoaAn animal subkingdom, comprised of primitive, single-celled, microscopic animals able to move by amoeboid action or by means of cilia or flagella. Many protozoa are parasitic on humans.General
proximalNearest to the point of attachment to the trunkdirectional
proxyA person authorized to decide or act for another person, for example, a person having durable power of attorney. General
prurigoA chronic inflammation of the skin characterized by a persistent eruption of papules that itch intensely.Integumentary
pruritus vulvaeItching of the vulva.reproductive
pseudarthrosisA new, false, fibrous joint arising at the site of an ununited fracture.Skeletal
pseudophakiaPresence of an intraocular lens after cataract extraction. Eyes And Ears
psipounds per square inch
psoriasisA skin disease that causes itchy patches of thick, red skin with silvery scales on the scalp and flexor joint surfaces.integumentary
psoriatic arthritisArthritis associated with psoriasis, affecting joints and the spine.Skeletal
PSVpressure supported ventilation respiratory
PSVTparoxysmal supraventricular tachycardiacardiovascular
psychiatryThe medical specialty that deals with the diagnosis, prevention and treatment of mental disorders. General
psychologyThe science dealing with the study of mental processes and behavior in man and animals. General
psychosisA condition characterized by a loss of contact with reality.General
psychotherapyA general term for the treatment of mental illness or emotional disturbances. General
PTphysical therapy
PTCApercutaneous transluminal coronary angioplastycardiovascular
-pterygiumabnormality of conjunctivamuscular
PTHparathyroid hormoneendocrine
ptosisDrooping of the upper eyelid.eyes and ears
-ptosisdrooping, prolapsegeneral
PTSDpost traumatic stress disordernervous
PTTpartial thromboplastin time cardiovascular
pub/opubic, pubesskeletal
pubertyBecoming first capable of reproducing sexually.endocrine
pubic boneA bone that forms the lower and anterior part of each side of the hip bone. Skeletal
pubic symphysisA slightly movable cartilaginous joint which occurs between the pubic bones. Skeletal
PUDpeptic ulcer diseasedigestive
pudendal nerveA nerve which originates in the sacral spinal cord (S2 to S4) and innervates the perineum, the external genitalia, the external anal sphincter and the external urethral sphincter. Can be damaged in childbirth.Nervous
puerperalThe period up until six to eight weeks after childbirth.Reproductive
pulmonaryPertaining to the lungs.Respiratory
pulmonary arteryThe short wide vessel that moves blood from the right ventricle to the lungs. Cardiovascular
pulmonary circulationThe circulation of the blood to and through the lungs Cardiovascular
pulmonary edemaExcessive accumulation of fluid in the lung. Can be life-threatening. Often associated with heart failure.Respiratory
pulmonary embolismA clot blocking of the pulmonary artery or one of its branches. Respiratory
pulmonary fibrosisProgressive formation of fibrotic (scar) tissue in the lungs. Patients show increasing dyspnea.Respiratory
pulmonary function testA battery of tests that evaluate the volume and flow rate of air in and out of the lungs.Respiratory
pulmonary infarctionnecrosis of lung tissue that is cause by the lack of oxygen or blood supply. The most common cause of pulmonary infarction is a blood clot in the lung. Respiratory
pulmonary valveThe heart valve at the intersection of the right ventricle and the pulmonary artery. Cardiovascular
pulmonary valve regurgitationBack flow of blood from the pulmonary artery into the right ventricular due to a leaky pulmonary valve. Cardiovascular
pulmonary valve stenosisThe pathologic narrowing of the pulmonary valve opening. Limits blood flow from the right ventricle to the pulmonary artery.Cardiovascular
pulmonary veinsThe veins that return the oxygenated blood from the lungs to the left atrium of the heart. Cardiovascular
pulmonologistAn internal medicine specialist concerned with the diagnosis and treatment of diseases and defects of the lungs and bronchial tree. Respiratory
pulpA soft mass of tissue.General
puls/obeating, to beatcardiovascular
pulseThe rhythmical expansion and contraction of an artery, caused by blood pumping from the heart. Cardiovascular
pulse oximeterDevice that measures oxygen saturation in the blood.Respiratory
-punctureto pierce a surfacegeneral
pupilThe aperture in the iris through which light passes. Eyes And Ears
pupill/opupileyes and ears
purkinje fibersCardiac muscle fibers that conduct the cardiac impulse from the atrioventricular node to the ventricles causing them to contract.Cardiovascular
purpuraBlood spots on the skin that are purple-colored, between 4-10 mm resembling bruising.integumentary
purul/opus formationgeneral
purulentPertaining to pus.integumentary
PUVApsoralen ultraviolet A integumentary
PVCpremature ventricular contraction cardiovascular
pyarthrosisAcute inflammation of synovial membranes.Skeletal
pyel/orenal pelvisurinary
pyelectasisDilation of the pelvis of the kidney.Urinary
pyelitisInflammation of the renal pelvis.Urinary
pyelocystitisInflammation of the kidney pelvis and the urinary bladder. Urinary
pyelonephritisInflammation of the kidney involving the renal parenchyma (the nephrons), kidney pelvis and kidney calices. It is characterized by abdominal pain, fever, nausea, vomiting and occasionally diarrhea. Urinary
pykn/othick, dense, compactgeneral
pyl/eportal veingeneral
pylethrombosisThrombosis of the portal vein.Cardiovascular
pylor/opylorus (opening between the stomach and duodenum)digestive
pylorusThe region of the stomach at the junction with the duodenum.Digestive
pyodermaAny purulent skin disease. Integumentary
pyogenicProducing pus.General
pyometraAccumulation of pus in the uterine cavity.Reproductive
pyomyositisAn acute, intramuscular suppuration of the large skeletal muscle groups. Muscular
pyonephrosisDistention of kidney with the presence of pus and destruction of the renal parenchyma. It is often associated with renal obstruction and can lead to total or nearly total loss of renal function. Urinary
pyr/ofire, fevergeneral
pyrosisSubsternal pain or burning sensation, usually associated with regurgitation of gastric juice into the esophagus. Also called heartburn.Digestive
pyuriaWhite blood cells or pus cells in the urine.urinary

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