from
The Collaborative International Dictionary of English v.0.48
Force pump \Force" pump`\ (Mach.)
(a) A pump having a solid piston, or plunger, for drawing
and forcing a liquid, as water, through the valves; in
distinction from a pump having a bucket, or valved
piston.
(b) A pump adapted for delivering water at a considerable
height above the pump, or under a considerable
pressure; in distinction from one which lifts the
water only to the top of the pump or delivers it
through a spout. See Illust. of {Plunger pump}, under
{Plunger}.
[1913 Webster]