Return to dictionary »

Medical Dictionary: o

TermDefinitionCategory
O2oxygen respiratory
OBobstetrics reproductive
ob-againstgeneral
OB/GYNobstetrics & gynecologyreproductive
obesityBeing too heavy for one's height.digestive
obliqueA slanting direction.muscular
obsessive behaviorRepetitive, compulsive behavior.General
obsessive compulsive disorderAn anxiety disorder characterized by recurrent, unwanted obsessions and compulsions. nervous
obstetr/omidwifereproductive
obstetricianA medical doctor specialized in the management of pregnancy, labor and birthGeneral
obstetricsThe branch of medicine concerned with the care of women during pregnancy, parturition, and the puerperium.Reproductive
obstipationSevere constipation caused by obstruction in the intestines.Digestive
obtundTo blunt or deaden pain.Nervous
obturator muscleEither of the two muscles that cover the outer surface of the anterior wall of the pelvis, responsible for rotating the thighs outward.Muscular
OCoral contraceptive reproductive
occipital boneThe curved, shield-shaped bone forming the lower rear part of the skull, enclosing the foramen magnum. Skeletal
occlusionThe blockage of a blood vessel.Cardiovascular
OCDobsessive-compulsive disorder nervous
ochronosisThe discoloration of body tissues,due to a metabolism disorder.Integumentary
oct-eightgeneral
ocul/oeyeeyes and ears
ocular absorptionUptake of substances by tissues of the eye. Eyes And Ears
ocular hypertensionA condition in which the intraocular pressure is elevated above normal and which may lead to glaucoma. Eyes And Ears
ocular hypotensionAbnormally low intraocular pressure often related to chronic inflammation. Eyes And Ears
oculomotorPertaining to or affecting eye movements.Eyes And Ears
odont/otoothdigestive
odontogenesisThe process of tooth development.Skeletal
odontomaA mixed tumor of odontogenic origin,General
odyn-painnervous
odynophagiaPainful swallowing.Digestive
-oidresemblinggeneral
ointmentsA medicated formulation with an oil baseGeneral
-olesmall, littlegeneral
oleo-oilgeneral
olfact/osmellgeneral
olfactoryRelating to the sense of smell.General
olfactory bulbThe area of the forebrain where the olfactory nerves terminate.General
olfactory nerveThe first cranial nerve. The olfactory nerve conveys the sense of smell. Nervous
olig/ofew, scantygeneral
oligodontiaAbsence of some teeth.Skeletal
oligohydramniosA condition of abnormally low amniotic fluid volume. Reproductive
oligomenorrheaLight or infrequent menstrual periods. reproductive
oligospermiaA deficiency of spermatozoa in the semen, defined as a sperm count below 20 million per milliliter semen. Reproductive
oliguriaDecreased urinary output. urinary
om/oshoulderskeletal
-omatumor, neoplasmlymphatic
omentumA double-layered fold of peritoneum that attaches the stomach to other organs in the abdominal cavity. Digestive
omphal/oumbilicus (navel)reproductive
omphalitisInflammation of the umbilicus.General
onc/oswelling, tumorlymphatic
oncocytomaA rare, benign tumor usually occurring in the parotid glands in older patients.General
oncogeneA mutated gene that causes the transformation of normal cells into cancerous cells.General
oncolysisDestruction of a neoplasm.General
oncoticPertaining to swelling or edema.General
ontogenyThe developmental history of an individual from inception to maturity.Reproductive
onych/ofingernail, toenailintegumentary
onychocryptosisAn ingrown toenail.integumentary
onycholysisLoosening or separation of nail plate from the underlying nail bed. General
onychomycosisA fungal infection of the nails.integumentary
oophor/oovaryreproductive
oophorectomySurgical removal of an ovary or ovaries.reproductive
oophoritisInflammation of the ovary.Reproductive
OPDoutpatient department
operculumA lid or covering.General
ophry/oeyebroweyes and ears
ophthalm/oeyeeyes and ears
ophthalmiaSevere inflammation of the eye.Eyes And Ears
ophthalmicPertaining to the eye.Eyes And Ears
ophthalmologyA surgical specialty concerned with the treatment of eye defects and diseases. Eyes And Ears
ophthalmoplegiaParalysis of one or more of the ocular muscles. Eyes And Ears
ophthalmoscopyAn examination of the back part of the eye (fundus), which includes the retina, optic disc, choroid, and blood vessels.eyes and ears
-opiavision conditioneyes and ears
opiateA narcotic containing opium or its derivatives.General
opisth-behindSkeletal
opiumThe air-dried juice of the unripe seed capsule of the opium poppy.General
oppositionRelation of the position of the thumb to the other fingers.Skeletal
-opsyprocess of viewinggeneral
opt/oeye, visioneyes and ears
optic nerveThe second cranial nerve which conveys visual information from the retina to the brain. Eyes And Ears
optic neuritisInflammation of the optic nerve.Eyes And Ears
optic tractNerve fiber originating from the optic chiasm that connects predominantly to the lateral geniculate bodies. it is the continuation of the visual pathway that conveys the visual information originally from the retina to the optic chiasm via the optic nerves. Eyes And Ears
optometryThe professional practice of primary eye and vision care that includes the measurement of visual refractive power and the correction of visual defects with lenses or glasses. Eyes And Ears
ORoperating room
or/omouthdigestive
oralPertaining to the mouth.Digestive
oral hygieneThe practice of personal hygiene of the mouth. It includes the maintenance of oral cleanliness, tissue tone, and general preservation of oral health. Digestive
orbitBony cavity that holds the eyeball and its associated tissues and appendages. Skeletal
orbital myositisInflammation of the extraocular muscle of the eye. It is characterized by swelling.Eyes And Ears
orchid/otesticlesreproductive
orchidalgiaPain in the testicle.Reproductive
orchidectomySurgical removal of one or both testicles.reproductive
orchiectomyThe surgical removal of one or both testicles. Reproductive
orchiopexySurgery to move an undescended testicle into the scrotum.reproductive
orchitisInflammation of a testis. Reproductive
-orexiaappetitenervous
organ/oorgangeneral
organellesSpecialized intracellular structure present in eukaryotic cells.General
organogenesisFormation of differentiated cells and complicated tissue organization to provide specialized functions. General
orgasmThe climax of sexual excitement. Reproductive
ori-mouthdigestive
ORIFopen reduction internal fixation skeletal
oropharynxThe middle portion of the pharynx that lies posterior to the mouth, inferior to the soft palate, and superior to the base of the tongue and epiglottis. Digestive
orth/ostraightgeneral
orthodonticsThe dental specialty dealing with correction of dental abnormalities.Skeletal
orthopedicsA surgical specialty which treats and corrects injuries, deformities and diseases to the skeletal system and joints. Skeletal
orthopneaDyspnea when lying flat.Respiratory
orthostaticPertaining to a erect posture.General
orthoticA device for correcting an orthopedic problem. Commonly used for the foot.skeletal
orthotic devicesA device used to support, align, or correct deformities of movable parts of the body. Skeletal
osche/oscrotumreproductive
oscill/oswinggeneral
-osea carbohydratedigestive
OSHAOccupational Safety and Health Administration
-osisabnormal conditiongeneral
osm/osense of smellrespiratory
osmosisTendency of fluids to move from the less concentrated to the more concentrated side of a semipermeable membrane. General
oss/eboneskeletal
oss/iboneskeletal
osseousComposed of or resembling bone. Skeletal
ossicleA small bone, especially of the middle ear.Eyes And Ears
ossificationThe formation of bone.General
oste/oboneskeletal
osteitisInflammation of the bone. skeletal
osteoarthritisA progressive, degenerative joint disease, the most common form of arthritis.skeletal
osteoblastomaA benign, painful, vascular tumor of bone marked by the formation of osteoid tissue, primitive bone and calcified tissue.Skeletal
osteochondritisInflammation of a bone and its overlaying cartilage. Skeletal
osteochondromaA cartilage-capped benign tumor that often appears as a stalk on the surface of bone.skeletal
osteochondrosisAny of a group of disorders of the growth ossification centers in childrenSkeletal
osteocytesMature osteoblasts that have become embedded in the bone matrix. Skeletal
osteogenesisThe process of bone formation. Skeletal
osteologyThe science that studies the structure and function of bones. Skeletal
osteolysisDissolution of bone.Skeletal
osteomaA benign, slow growing tumor composed of bone tissue.Skeletal
osteomalaciaAn interruption of the mineralization of organic bone matrix leading to bone softening, bone pain, and weakness. It is the adult form of rickets.skeletal
osteonecrosisDeath of a bone or part of a bone.skeletal
osteophyteBony projection usually found around joints and often seen in arthritis. Skeletal
osteoporosisReduction of bone mass without alteration in the composition of bone, leading to fractures. skeletal
osteosarcomaA sarcoma originating in bone-forming cells, affecting the ends of long bones. lymphatic
osteosclerosisAn abnormal hardening or increased density of bone tissue. Skeletal
osteotomyCutting of a bone.Skeletal
ostomySurgery to create an artificial opening (stoma) into the urinary or gastrointestinal canal. Digestive
OToccupational therapy
ot/oear, hearingeyes and ears
otalgiaEar ache.eyes and ears
OTCover-the-counter
otitisInflammation of the ear, which may be marked by pain, fever, hearing disorders and vertigo. Eyes And Ears
otitis mediaAn ear infection of the middle ear, the area just behind the eardrum.eyes and ears
otolaryngologyA surgical specialty concerned with the study and treatment of disorders of the ear, nose, and throat. Eyes And Ears
otologyThe study of diseases of the ear.Eyes And Ears
otomycosisA fungal infection of the external auditory canal.eyes and ears
otopyorrheaDischarge of pus from ear.eyes and ears
otorrheaEar discharge.eyes and ears
otosclerosisA disease of the bones of the middle and inner ear.eyes and ears
otoscopeAn instrument designed to inspect the ear. Eyes And Ears
-ouspertaining togeneral
ov/oegg, ovumreproductive
ovari/oovaryreproductive
ovarianPertaining to the ovary.Reproductive
ovarian cystsGeneral term for cysts and cystic diseases of the ovary. Reproductive
ovarian neoplasmsTumors or cancer of the ovary. These neoplasms can be benign or malignant.Reproductive
ovaryEither of the sex glands in females. They produce ova and hormones.Reproductive
ovulationThe discharge of an ovum from a rupturing follicle in the ovary. Reproductive
ovumA mature haploid female germ cell extruded from the ovary at ovulation. Reproductive
ox/ioxygenrespiratory
ox/ooxygenrespiratory
oxa-oxygenrespiratory
oximetryThe determination of oxygen-hemoglobin saturation of blood.General
OXToxytocinendocrine
oxy-sharp, oxygenrespiratory
oxygenAn element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration. General
oxytocinA hormone secreted by the pituitary gland. It simulates contraction during labor and the production of milk. endocrine
ozounce
ozoneAn unstable, poisonous allotrope of oxygen.General

An error has occurred. This application may no longer respond until reloaded. Reload 🗙