Plun"ger (?), n.
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. Gun.
The firing pin of a breechloader.
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
© Webster 1913.