Definition of “piston” - English Dictionary

british dictionary

“piston” in British English

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pistonnoun [ C ]

uk /ˈpɪs.tən/ us /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 wheels

(Definition of “piston” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

“piston” in American English

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pistonnoun [ C ]

us /ˈpɪs·tən/

an engine part, usually a short, solid tube or round, flat object, which moves up and down or forward and backward inside a cylinder, and causes other parts of an engine or machine to move

(Definition of “piston” from the Cambridge Academic Content Dictionary © Cambridge University Press)