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2 definitions found
 for Piston
From The Collaborative International Dictionary of English v.0.48 :

  Piston \Pis"ton\, n. [F. piston; cf. It. pistone piston, also
     pestone a large pestle; all fr. L. pinsere, pistum, to pound,
     to stamp. See Pestle, Pistil.] (Mach.)
     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.
     [1913 Webster]
     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.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: United States neoclassical composer (1894-1976) [syn:
           Piston, Walter Piston]
      2: mechanical device that has a plunging or thrusting motion
         [syn: piston, plunger]

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