piston

Meanings

Plural: pistons

Noun

• United States neoclassical composer (1894-1976)
• mechanical device that has a plunging or thrusting motion
• 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)
• A valve device in some brass instruments for changing the pitch

Verb

• To move up and down or in and out like a piston.

Synonyms

plunger, Walter Piston