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English definition of “piston”

piston

noun [C]     /ˈpɪs.tən/
a short, solid piece of metal that moves up and down inside a cylinder in an engine to press the fuel into a small space and to send the power produced by it to the wheelsThe engine and engine partsEngines and motors
(Definition of piston noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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