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oligomenorrhea
Light menstrual flow.
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oligospermia
A low number of sperm in the semen.
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oliguria
A condition characterized by an abnormally small output of urine.
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oncology
The study of tumors.
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oophorectomy
The surgical removal of an ovary.
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ophthalmology
The branch of medicine that pertains to the eye and its diseases.
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optic neuritis
Inflammation of the optic nerve, which connects the eye to the brain. Symptoms include pain with eye movement, blurred vision…
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optical
Having to do with vision.
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optometry
The practice of eye and vision care.
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orbit
The bony cavity containing the eyeball. Eye socket.
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orchiectomy
The surgical removal of one or both testicles. Also called castration.
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organ
A structural unit of an animal or plant that serves a specific function.
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organic
Having to do with substances derived from living organisms.
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orgasm
Sexual climax.
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orifice
The entrance or outlet of a body cavity.
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oropharynx
The part of the pharynx behind the mouth and tongue.
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orthodontics
The branch of dentistry that deals with the correction of irregularities of the teeth and related facial problems.
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orthopedics
The branch of medicine that deals with the treatment of deformities, diseases and injuries of the bones, joints and…
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orthopnea
Difficulty breathing when lying flat.
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oscillation
A back-and-forth motion; vibration.
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Osgood-Schlatter disease
Inflammation of the bone and cartilage of the shin bone, just below the knee.
Trusted medical advice from the
American Academy of Family Physicians.
American Academy of Family Physicians.
Go to familydoctor.org Home
Trusted medical advice from the
American Academy of Family Physicians.
American Academy of Family Physicians.
Dictionary of Medical Terms
Gain a better understanding of medical terminology by searching our dictionary of more than 1,300 terms.
