• Piston

    Pronunciation

    • enPR: pÄ­s'tÉ™n, IPA: /ˈpɪstÉ™n/
    • Rhymes: -ɪstÉ™n

    Origin

    From French piston.

    Full definition of piston

    Noun

    piston

    (plural pistons)
    1. A solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)
    2. (music) A valve device in some brass instruments for changing the pitch
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