- A title conferred by a university on one who has followed a prescribed course of study, or given as a title of distinction; as doctor of medicine, laws, philosophy, etc.
- A physician, especially one on whom has been conferred the degree of M.D. by a university or medical school.
[L. a teacher, fr. doceo, pp. doctus, to teach]
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Examples: glitazone, GI cocktail, etc.