Etymology
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revolver (n.)

"revolving firearm," originally and especially a type of pistol able to fire multiple shots without reloading, 1835, agent noun from revolve (v.). So called by U.S. inventor Samuel Colt (1814-1862) for its revolving bored barrel (later models used a revolving chamber cylinder).

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Definitions of revolver

revolver (n.)
a pistol with a revolving cylinder (usually having six chambers for bullets);
Synonyms: six-gun / six-shooter
revolver (n.)
a door consisting of four orthogonal partitions that rotate about a central pivot; a door designed to equalize the air pressure in tall buildings;
Synonyms: revolving door
From wordnet.princeton.edu