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)

(firearms); (intransitive) To move up and down or in and out like a piston.

present participle of piston

A surname.

A surname.

plural of Pistone

simple past tense and past participle of piston

Having (a particular kind or number of) pistons.

plural of piston

Any of several types of engine having cylinders containing reciprocating pistons, in which a crankshaft is turned by pistons moving up and down within cylinders.