revolver

A pistol having a revolving cylinder with several cartridge chambers that may be fired in succession.

One that revolves, as a part of a mechanism.

A revolving credit agreement.

One who or that which revolves.

Specifically— A revolving firearm, especially a pistol, having a revolving barrel provided with a number of bores (as in earlier styles of the weapon), or (as in modern forms) a single barrel with a revolving cylinder at its base, provided with a number of chambers.