Dictionary

orchiectomy Orchidectomy.

orchidectomy The surgical removal of one or both testes.

orbital ridge The bony ridge beneath the eyebrow.

orbital In anatomy, pertaining to the orbit, the bony cavity that contains the eyeball.

orbit In medicine, the bony cavity in which the eyeball sits.

oral-motor apraxia of speech See apraxia of speech.

oral-motor Relating to the muscles of the mouth and/or to movements of the mouth.

oral surgeon A dentist who has special training in surgery to correct problems of the mouth and jaw.

oral rehydration therapy The administration of special fluids by mouth to treat dehydration. Abbreviated ORT. See also oral rehydration solution.

oral rehydration solution A specially designed liquid that contains water, glucose, and electrolytes and is given to treat dehydration. Abbreviated ORS.

oral contraceptive A birth control pill taken by mouth. Most oral contraceptives include both estrogen and progestogen. When given in certain amounts and at certain times in the menstrual cycle, these hormones prevent the ovary from releasing an egg for fertilization. Colloquially known as “the pill.” See also birth control; contraceptive.

oral cancer Cancer within the mouth. Oral cancer is associated with smoking cigarettes and cigars as well as chewing tobacco. It is generally noticed as a painless growth on the inner cheek, gum, or tongue. Treatment options include surgical resection, radiation, and/or chemotherapy.