Definitions from Wiktionary (Piston)

▸ noun:  (mechanics) 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)
▸ noun:  (music) A valve device in some brass instruments for changing the pitch
▸ verb:  (intransitive) To move up and down or in and out like a piston.
▸ noun:  A surname.
▸ Also see piston

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