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piston 音標拼音: [p'ɪstən] n. 活塞,瓣 活塞,瓣 Piston n 1: United States neoclassical composer ( 1894- 1976) [ synonym: { Piston}, { Walter Piston}] 2: mechanical device that has a plunging or thrusting motion [ synonym: { piston}, { plunger}] Piston \ Pis" ton\, n. [ F. piston; cf. It. pistone piston, also pestone a large pestle; all fr. L. pinsere, pistum, to pound, to stamp. See { Pestle}, { Pistil}.] ( Mach.) A sliding piece which either is moved by, or moves against, fluid pressure. It usually consists of a short cylinder fitting within a cylindrical vessel along which it moves, back and forth. It is used in steam engines to receive motion from the steam, and in pumps to transmit motion to a fluid; also for other purposes. [ 1913 Webster] { Piston head} ( Steam Eng.), that part of a piston which is made fast to the piston rod. { Piston rod}, a rod by which a piston is moved, or by which it communicates motion. { Piston valve} ( Steam Eng.), a slide valve, consisting of a piston, or connected pistons, working in a cylindrical case which is provided with ports that are traversed by the valve. [ 1913 Webster]
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