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piston
Definitions
[ˈpɪst(ə)n], (Noun)
Definitions:
- 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
Phrases:
Origin
:
early 18th century: from French, from Italian pistone, variant of pestone ‘large pestle’, augmentative of pestello ‘pestle’
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definition by Oxford Dictionaries