Source : Webster's Revised Unabridged Dictionary (1913)

Revolver \Re*volv"er\, n.
   One who, or that which, revolves; specifically, a firearm (
   commonly a pistol) with several chambers or barrels so
   arranged as to revolve on an axis, and be discharged in
   succession by the same lock; a repeater.

Source : WordNet®

revolver
     n 1: a pistol with a revolving cylinder (usually having six
          chambers for bullets) [syn: {six-gun}, {six-shooter}]
     2: a door consisting of four orthogonal partitions that rotate
        about a central pivot; a door designed to equalize the air
        pressure in tall buildings [syn: {revolving door}]