pis´ton|like´

pis´ton|like´
pis|ton «PIHS tuhn», noun.
1. a disk or short cylinder of wood or metal, fitting closely inside a tube or hollow cylinder in which it is moved back and forth by some force, such as the pressure of steam. A piston receives or transmits motion by means of a rod that is attached to it. Pistons are used in pumps, engines, and compressors.
2. a sliding valve in a brass-wind instrument that moves in a cylinder by finger pressure, opening the air passage into additional tubings (crooks) which extend the effective length of the air passage and lower the pitch (a half step, whole step, or one and a half steps lower).
╂[< earlier French piston < Italian pistone < pistare to pound2 < Late Latin pistāre (frequentative) < pīnsere to pound2]
–pis´ton|like´, adjective, adverb.

Useful english dictionary. 2012.

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