Revolver

wiktionary

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revolve +‎  -er,  coined by American inventor Samuel Colt in 1835. [1]

etymonline

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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).