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n. A solid cylinder or disk that fits snugly into a larger cylinder and moves under fluid pressure, as in a reciprocating engine, or displaces or compresses fluids, as in pumps and compressors.

n. Music A valve mechanism in brass instruments for altering the pitch.

n. 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)

n. A valve device in some brass instruments for changing the pitch

n. A sliding piece which either is moved by, or moves against, fluid pressure. It usually consists of a short cylinder fitting within a cylindrical vessel along which it moves, back and forth. It is used in steam engines to receive motion from the steam, and in pumps to transmit motion to a fluid; also for other purposes.

n. In machinery, a movable piece, generally of a cylindrical form, so fitted as to fill the sectional area of a tube, such as the barrel of a pump or the cylinder of a steam-engine, and capable of being driven alternately in two directions by pressure on one or the other of its sides.

n. In musical wind-instruments of the trumpet family, one of the forms of valve whereby a crook is temporarily added to the tube and the pitch of the tones altered.

n. In organ-building, a thumb-knob which may be pushed in like a piston, whereby some change in registration is pneumatically effected; a pneumatic coupler or combination knob.

n. The central retractile part of the acetabulum or sucker of a cephalopod, whose action in producing a vacuum resembles that of the piston of an air-pump.

n. United States neoclassical composer (1894-1976)

n. mechanical device that has a plunging or thrusting motion

"But Black has size on his side and keeps forcing him against the ropes, getting in short piston blows into his ribs, which seem to move with a life of their own after the first blow."

composer    mechanical device   

oscillating piston    displacer piston    combination piston    telescopic piston    piston blowing-machine    spring-piston    double-piston locomotive    differential piston   

piston ring    piston rod   

plunger    ram    bucket   

Kristen    Liston   

valve    cylinder    diaphragm    plunger    lever    rod    compressor    bolt    brake    screw