Piston
/pˈɪstən/
Listen pronunciation
Definition
(noun) A solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)
Sentence Examples
This shaft links with a piston.
The piston does not come into contact with the cylinder cover.
CEFR Practice Quiz
The engine's ____ moved up and down rapidly, converting the fuel's energy into mechanical power.