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Medical Dictionary Starting with O

Oat Cell Carcinoma

Another term for small-cell carcinoma

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Obesity

The condition of being obese; increased body weight caused by excessive accumulation of fat.

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Obstetrics

Surgical specialty, care of a woman & offspring during pregnancy, childbirth and the puerperium (the period shortly after birth)

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Obstipation

Severe constipation caused by intestinal obstruction

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Obstructive Sleep Apnea

The blockage of the airways during sleep, which causes breathing to stop for very short periods of time

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Obturate

With reference to endodontics, refers to the sealing of the canal(s) of tooth roots during root canal therapy procedure

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Obturator

A disc or plate which closes an opening; a prosthesis that closes an opening in the palate

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Occlusal

Pertaining to the biting surfaces of the premolar and molar teeth or contacting surfaces of opposing teeth or opposing occlusion rims

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Occlusal Radiograph

An intraoral radiograph made with the film, phosphorous plate, emulsion or digital sensor being held between the occluded teeth

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Occlusal Surface

A surface of a posterior tooth or occlusion rim that is intended to make contact with an opposing occlusal surface

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Occlusion

The blocking of an opening or passageway in the body

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Occlusion of the Ductus

An obstruction or a closure of a passageway or vessel

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Occult Blood

Blood in the feces that can be detected only by chemical tests

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Occupational

Disease that results directly or indirectly from the patient's job

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Occupational Disease

Industrial Disease; A pathological condition resulting from a toxic agent, a hazard, or a repetitive operation encountered during the usual performance of one's occupation

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Occupational Therapy

Treatment to relearn physical skills lost as a result of an illness or accident

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Ocular

Describes something related to the eyes

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Oculomotor Nerves

Nerves that stimulate movement of the eyeball

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Odontitis

Inflammation of the teeth

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Odontogenic

Refers to tooth-forming tissues

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Odontogenic Cyst

Cyst derived from the epithelium of odontogenic tissue (developmental, primordial)

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Odontoplasty

Adjustment of tooth length, size, and/or shape; includes removal of enamel projections

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Oedema

Oedema is a build-up of fluid in the body which causes the affected tissue to become swollen

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Off-Label

Use of an FDA-approved drug for an indication other than that for which it was approved

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Olecranon

Proximal bony projection of the ulna at the elbow

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Olecranon Bursitis

Inflammation of the olecranon bursa

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Olfactory Nerves

Nerves that play a role in the sense of smell

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Oligodendroglioma

A rare type of cancerous brain tumor that occurs most commonly in the cerebrum

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Oligohydramnios

An unusually small amount of amniotic fluid surrounding the fetus in the uterus, which can lead to complications with the pregnancy

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Oligospermia

A low level of sperm in the semen

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Onchocerciasis

Infection with worms of the genus Onchocerca Human infection is caused by O volvulus, with heavy infestations usually characterized by the firm subcutaneous nodules called onchocercomas; a persistent ...

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Oncogen

An agent that promotes neoplastic cell growth, or cancer

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Oncogenes

Genes that, when altered by environmental factors or viruses, can cause abnormal cell growth

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Oncogenesis

The development and growth of cancer

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20000+ Medical & Health Terms for Doctors, students & patients from a medical dictionary. Our experts define difficult medical & health language in easy-to-understand explanations of each and every medical term.

Medical & Health Terms online medical dictionary provides quick & easy access to hard-to-spell and often misspelled medical & health definitions through an extensive alphabetical A-Z listing.

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