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From The Collaborative International Dictionary of English v.0.48:
Surgeon \Sur"geon\, n. [OE. surgien, OF. surgien, contr. fr. chirurgien. See Chirurgeon.] 1. One whose profession or occupation is to cure diseases or injuries of the body by manual operation; one whose occupation is to cure local injuries or disorders (such as wounds, dislocations, tumors, etc.), whether by manual operation, or by medication and constitutional treatment. [1913 Webster] 2. (Zool.) Any one of numerous species of chaetodont fishes of the family Teuthidae, or Acanthuridae, which have one or two sharp lancelike spines on each side of the base of the tail. Called also surgeon fish, doctor fish, lancet fish, and sea surgeon. [1913 Webster] Surgeon apothecary, one who unites the practice of surgery with that of the apothecary. --Dunglison. Surgeon dentist, a dental surgeon; a dentist. Surgeon fish. See def. 2, above. Surgeon general. (a) In the United States army, the chief of the medical department. (b) In the British army, a surgeon ranking next below the chief of the medical department. [1913 Webster]