piston

1. 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. Source: opted

2. n. mechanical device that has a plunging or thrusting motion Source: wordnet

3. 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. Piston head (Steam Eng.), that part of a piston which is made fast to the piston rod. -- Piston rod, a rod by which a piston is moved, or by which it communicates motion. -- Piston valve (Steam Eng.), a slide valve, consisting of a piston, or connected pistons, working in a cylindrical case which is provided with ports that are traversed by the valve. Source: webster

4. A sliding piece which either is moved by, or moves against,fluid pressure. It usually consists of a short cylinder fittingwithin a cylindrical vessel along which it moves, back and forth. Itis used in steam engines to receive motion from the steam, and inpumps to transmit motion to a fluid; also for other purposes. Pistonhead (Steam Eng.), that part of a piston which is made fast to thepiston rod.-- Piston rod, a rod by which a piston is moved, or by which itcommunicates motion.-- Piston valve (Steam Eng.), a slide valve, consisting of a piston,or connected pistons, working in a cylindrical case which is providedwith ports that are traversed by the valve. Source: adambom

5. n:100 n. United States neoclassical composer (1894-1976) n. mechanical device that has a plunging or thrusting motion Source: ecdict

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