Meaning of PISTON in English

PISTON

n.1 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 impart motion, or in a pump to receive motion.

2 a sliding valve in a trumpet etc.

Phrases and idioms:

piston-ring a ring on a piston sealing the gap between the piston and the cylinder wall. piston-rod a rod or crankshaft attached to a piston to drive a wheel or to impart motion.

Etymology: F f. It. pistone var. of pestone augment. of pestello PESTLE

Oxford English vocab.      Оксфордский английский словарь.