The Collaborative International Dictionary of English v.0.48:

Suction \Suc"tion\, n. [L. sugere, suctum, to suck; cf. OF.
   suction. See Suck, v. t.]
   The act or process of sucking; the act of drawing, as fluids,
   by exhausting the air.
   [1913 Webster]

   Suction chamber, the chamber of a pump into which the
      suction pipe delivers.

   Suction pipe, Suction valve, the induction pipe, and
      induction valve, of a pump, respectively.

   Suction pump, the common pump, in which the water is raised
      into the barrel by atmospheric pressure. See Illust. of
      Pump.
      [1913 Webster]

WordNet (r) 3.0 (2006):

suction pump
    n 1: a pump for raising fluids by suction