piston

Mane

Noun

1. 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)
2. A valve device in some brass instruments for changing the pitch

Verb

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

Wekî (IPA) tê gotin

/ˈpɪstən/

Etîmolojî

From French piston.