Plunger
Plunger , noun
1.
One who, or that which, plunges; a diver.
2.
A long solid cylinder, used, instead of a piston or bucket, as a forcer in pumps.
3.
One who bets heavily and recklessly on a race; a reckless speculator. [Cant]
4.
(Pottery) A boiler in which clay is beaten by a wheel to a creamy consistence. — Knight
5.
(Gunnery) The firing pin of a breechloader.
Collocations (3)
Plunger bucket , a piston, without a valve, in a pump.
Plunger pole , the pump rod of a pumping engine.
Plunger pump , a pump, as for water, having a plunger, instead of a piston, to act upon the water. It may be single-acting or double-acting