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piston

Pronunciation: /ˈpɪstən/

The English word “piston” has 3 meanings listed here.

noun

  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. A valve device in some brass instruments for changing the pitch

verb

  1. To move up and down or in and out like a piston.

Etymology

Borrowed from French piston.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.