[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’