suction
    n 1: a force over an area produced by a pressure difference
    2: the act of sucking [syn: sucking, suck, suction]
    v 1: remove or draw away by the force of suction; "the doctors
         had to suction the water from the patient's lungs"
    2: empty or clean (a body cavity) by the force of suction;
       "suction the uterus in an abortion"

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]