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piston
WordNet 2.0
  • mechanical device that has a plunging or thrusting motion
  • United States neoclassical composer (1894-1976)
piston
Webster's Revised Unabridged Dictionary (1913)
  • 1. 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.

 

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