Source : Webster's Revised Unabridged Dictionary (1913)

Forcer \For"cer\, n.
   1. One who, or that which, forces or drives.

   2. (Mech.)
      (a) The solid piston of a force pump; the instrument by
          which water is forced in a pump.
      (b) A small hand pump for sinking pits, draining cellars,
          etc.