plunger bucket

Webster's Dictionary (GCIDE)

1.One who, or that which, plunges; a diver. [1913 Webster]

2.A long solid cylinder, used, instead of a piston or bucket, as a forcer in pumps. [1913 Webster]

3.One who bets heavily and recklessly on a race; a reckless speculator. [Cant] [1913 Webster]

4.(Pottery) A boiler in which clay is beaten by a wheel to a creamy consistence. --Knight. [1913 Webster]

5.(Gun.) The firing pin of a breechloader. [1913 Webster]

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 [1913 Webster]