Source : Webster's Revised Unabridged Dictionary (1913)

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.

   2. (Zo["o]l.) Any one of numerous species of ch[ae]todont
      fishes of the family {Teuthid[ae]}, or {Acanthurid[ae]},
      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}.

   {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.

Source : WordNet®

Surgeon General
     n 1: the head of the United States Public Health Service
     2: the senior medical officer in an army or navy