piston
piston
[ˈpɪst(ə)n]
noun
[ˈpɪst(ə)n]
noun
- a disc or short cylinder fitting closely within a tube in which it moves up and down against a liquid or gas, used in an internal-combustion engine to derive motion, or in a pump to impart motion
活塞
■a valve in a brass musical instrument in the form of a piston, depressed to alter the pitch of a note
（铜管乐器上的）活塞阀键
- early 18th cent.: from French, from Italian pistone, variant of pestone 'large pestle', augmentative of pestello 'pestle'
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