force pump

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A pump with a solid piston and valves used to raise a liquid or expel it under pressure.

from The Century Dictionary.

• noun A pump, of widely varying types, which delivers a liquid under pressure, so as to eject it forcibly: distinguished from a lift-pump, in which the liquid is simply lifted and runs out of the spout. Also called forcing-pump. See pump.

from the GNU version of the Collaborative International Dictionary of English.

• 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.
• 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.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun pump used to force a liquid up and expel it under pressure