A physician; a member of the medical profession; one who is trained and licensed to heal the sick or injured. The final examination and qualification may award a doctor degree in which case the post-nominal letters are D.O., DPM, M.D., DMD, DDS, in the US or MBBS in the UK.
From Middle English ("an expert, authority on a subject"), doctour, from Anglo-Norman doctour, from Latin doctor ("teacher"), from doceō. Displaced native Middle English lerare ("doctor, teacher") (from Middle English leren ("to teach, instruct") from Old English læran ("to teach, instruct, guide"), compare Old English lārēow ("teacher, master")). Displaced Old English lǣċe ("doctor, physician").
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