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What does piston mean?

Looking for the meaning or definition of the word piston? Here's what it means.

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. (music) A valve device in some brass instruments for changing the pitch
Verb
  1. (intransitive) To move up and down like a piston.
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