throttle valve

noun

Definition of throttle valve 

: a valve designed to regulate the supply of a fluid (as steam or gas and air) to an engine and operated by a handwheel, a lever, or automatically by a governor especially : the valve in an internal-combustion engine incorporated in or just outside the carburetor and controlling the volume of vaporized fuel charge delivered to the cylinders

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History and Etymology for throttle valve

throttle entry 1 + valve

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