suction pump

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

• noun A pump for drawing up a liquid by means of suction produced by a piston drawn through a cylinder.

from The Century Dictionary.

• noun As a piece of chemical apparatus, same as filter-pump.
• noun A pump having a barrel placed above the level of the water to be drawn, a suction-pipe extending from the barrel down into the water to be raised, an inlet-valve opening inward or toward the piston, and an outlet-valve in the piston.

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

• noun a pump for raising fluids by suction