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valveless Definition
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valveless
noun(valve)any of numerous mechanical devices by which the flow of liquid, gas, or loose material in bulk may be started, stopped, or regulated by a movable part that opens, shuts, or partially obstructs one or more ports or passageways; also : the movable part of such a device
valveless
noun(valve)a device in a brass instrument for quickly channeling air flow through an added length of tube in order to change the fundamental tone by some definite interval
valveless
noun(valve)electron tube