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n. One who, or that which, plunges; a diver. A long solid cylinder, used, instead of a piston or bucket, as a forcer in pumps. One who bets heavily and recklessly on a race; a reckless speculator.

 - (Pottery) A boiler in which clay is beaten by a wheel to a creamy consistence.

 - (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.

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