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Medical Dictionary: r

R/Orule out general
Raradium general
rabiesAcute viral infection affecting mammals, including humans.lymphatic
rachi/ospinal columnskeletal
radradiation absorbed dose
RAD (2)right anterior descendingCardiovascular
radi/ox-rays, radiusgeneral
radial arteryAn artery in the forearm that starts at the bifurcation of the brachial artery and passing in branches to the forearm, wrist, and hand. Cardiovascular
radial keratotomyA surgical procedure used to decrease nearsightedness.eyes and ears
radial nerveA major nerve of the upper extremity, originating in the lower cervical and upper thoracic spinal cord, traveling via the posterior cord of the brachial plexus, and supplying motor innervation to extensor muscles of the arm and cutaneous sensory fibers to extensor regions of the arm and hand. Nervous
radiationElectromagnetic energy that travels through empty space with the speed of light.General
radicul/onerve rootnervous
radicular cystA slow growing cyst of the periodonal tissue at the root of a tooth.General
radiculopathyDisease involving a spinal nerve root.Nervous
radiographyExamination of any part of the body for diagnostic purposes by means of X-rays or gamma rays.General
radioisotopesIsotopes that exhibit radioactivity.General
radiologyA medical specialty concerned with the use of x-ray and other forms of radiant energy in the diagnosis and treatment of disease. General
ramusA branch, as of a nerve, blood vessel or bone.General
ranulaA cyst found on the floor of the mouth. Also called sublingual cyst.General
rapeSexual intercourse without consent of the victim. General
rashA temporary eruption of spots on the skin.Integumentary
rationalizationAn unconscious defense mechanism in which a person attempts to justify behavior while ignoring the real reasons.General
Raynaud diseaseAn idiopathic vascular disorder of small arteries and arterioles.Cardiovascular
RBBBright bundle branch blockcardiovascular
RBCred blood cell; red blood count cardiovascular
RDArecommended daily/dietary allowance digestive
RDSrespiratory distress syndrome respiratory
Rerhenium general
re-again, backgeneral
recessiveDescribing a gene capable of producing its characteristic phenotype in the organism only when its allele is identical.General
rectoceleHerniation of the rectum into the vagina. General
rectumThe distal segment of the large intestine, between the sigmoid colon and the anal canal. Digestive
recurrenceThe return of a sign, symptom, or disease after a remission. General
referred painPain felt at a place in the body different from the injured or diseased part.General
reflexA quick, involuntary movement or exercise of function, in response to a stimulus applied to the periphery and transmitted to the brain or spinal cord. Nervous
reflex arcThe neural path of a reflex.Nervous
regimenA systematic plan for therapy, often involving diet, exercise and medication.General
regurgitationThe return of partly digested food from the stomach to the mouth. Also, the backflow of blood past an abnormal heart valve.General
rejuvenationThe restoration of youthfulness, vitality, and freshness. General
relapseThe return of disease symptoms after partial recovery.General
REMrapid eye movement nervous
rem sleepA stage of sleep characterized by rapid eye movements and low voltage fast pattern EEG. It is usually associated with dreaming. Nervous
remissionThe abatement or disappearance of a disease as a result of treatment. General
renalPertaining to the kidneys.General
reperfusionRestoration of blood supply to tissue which was ischemic.Cardiovascular
replicationThe process by which double-stranded DNA makes copies of itself when the cell divides.General
resectionSurgical removal of all or part of a structure, organ or tissue.General
residual volumeThe volume of air remaining in the lungs at the end of a maximal expiration.Respiratory
respiratory systemThe organs and structures that bring about gas exchange between ambient air and the blood.Respiratory
respiratory therapyCare of patients with abnormalities associated with the pulmonary system. Respiratory
restenosisThe recurrence of stenosis in an artery after previous treatment.Cardiovascular
resuscitationTo restore consciousness or other signs of life to one apparently dead.General
reteA network of blood vessels, fibers or nerves.General
retentionThe ability of the digestive system to hold fluids and food.Digestive
reticul/onet, networkgeneral
reticulocytesImmature erythrocytes.General
reticulocytosisAn increase in circulating reticulocytes, which is among the simplest and most reliable signs of accelerated erythrocyte production. General
retin/oretinaeyes and ears
retinaThe ten-layered nervous tissue membrane of the eye. The innermost layer of the eye, which receives images transmitted through the lens and contains the receptors for vision, the rods and conesEyes And Ears
retinitisInflammation of the retina. Eyes And Ears
retinopexyA surgery for certain types of retinal detachments.eyes and ears
retractorA surgical instrument used to draw aside and hold the edges of a wound or structures.General
Reye syndromeAn acquired encephalopathy of young children that follows an acute febrile illness, usually influenza or varicella infection.nervous
RFrheumatoid factor skeletal
Rhrhesus factorcardiovascular
rh factorA type of protein on the surface of red blood cells. Most people who have the Rh factor are Rh-positive. Those who do not have the Rh factor are Rh-negative.Cardiovascular
rhabdomy/ostriated musclemuscular
rhabdomyomaA rare, benign neoplasm derived from striated muscle.Muscular
rhabdomyosarcomaMalignant neoplasm derived from skeletal (striated) muscle.Muscular
RHDrheumatic heart disease cardiovascular
rhe/ostream, flow, electric currentcardiovascular
rheumatic diseasesDisorders of connective tissue, especially the joints and related structures, characterized by inflammation, degeneration, or metabolic derangement. Skeletal
rheumatic feverA disease occurring as a complication of inadequately treated strep throat infection. Can result in serious damage to heart valves.General
rheumatoid arthritisAn autoimmune disease that causes pain, swelling, and stiffness in the joints, commonly the hands and wrists. May lead to early crippling.skeletal
rheumatologyA subspecialty of medicine concerned with the study of inflammatory or degenerative processes and metabolic derangement of connective tissue structures which pertain to a variety of musculoskeletal disorders, such as arthritis. General
rhinitisInflammation of the nasal mucous membrane. Respiratory
rhinomanometryTechnique for measuring airflow and pressure in the nasal cavity during respiration. Respiratory
rhinoplastyPlastic surgery on the nose.General
rhinosporidiosisChronic, localized fungal infection of mucocutaneous tissues, especially the nose.Respiratory
rhonchiA coarse rattling breath sound somewhat similar to snoring.Respiratory
rhytidectomyA facelift.integumentary
rhytidoplastyPlastic surgery performed for the elimination of skin wrinkles. General
riboflavinVitamin B2.Digestive
ribsThe flat, curved bones that form a protective cage for the chest organs, consisting of twelve curved bones which connect to the vertebral column posteriorly and terminate anteriorly as costal cartilage. Skeletal
RICErest, ice, compression, elevationmuscular
ricketsA disease of growing bone caused by interruption of bone mineralization. Caused by lack of vitamin D.skeletal
rickettsiaA genus of gram-negative, aerobic, rod-shaped bacteria often surrounded by a protein micro capsular layer and slime layer. Transmitted to humans by arthropods. Cause Lyme Disease, Rocky Mountain Spotted Fever, Typhus.lymphatic
rigor mortisMuscular rigidity which develops in the cadaver usually from 4 to 10 hours after death and lasts 3 or 4 days. General
RINDreversible ischemic neurologic deficitnervous
RLEright lower extremity directional
RLLright lower lobe directional
RLQright lower quadrant directional
RMLright middle lobe of lung respiratory
Rnradon general
rnaAny of a class of nucleic acids that can encode genetic information and play an essential role in protein synthesis.General
RNPRegistered Nurse Practitioner
ROMrange of motion skeletal
ROSreview of systems
rosaceaA common, chronic skin condition characterized by facial redness and often small, red pus-filled bumps. Also known as "Adult Acne".integumentary
rot-wheel, turnGeneral
rotator cuffThe musculotendinous sheath formed by the supraspinatus, infraspinatus, subscapularis, and teres minor muscles. These help stabilize the head of the humerus in the glenoid fossa and allow for rotation of the shoulder joint about its longitudinal axis. Muscular
RPhRegistered Pharmacist
RPMrevolutions per minute
RQrespiratory quotient respiratory
RRrecovery room
RR (2)respiratory rateRespiratory
-rrhagebursting forthcardiovascular
-rrheadischarge, flowgeneral
RSIrepetitive stress injurymuscular
RSVrespiratory syncytial virus respiratory
RTRespiratory Therapistrespiratory
rubellaInfectious viral disease caused by virus entering the respiratory tract and spreading to the lymphatic system. Often affecting children and nonimmune young adults. High risk of deafness in fetus. Preventable with MMR vaccine.lymphatic
RUEright upper extremity directional
RULright upper lobe directional
ruptureForcible or traumatic tear of an organ or other soft part of the body. General
RUQright upper quadrant directional
RVresidual volumerespiratory
Rxprescription, medication

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