GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Plunger , n.
   One who, or that which, plunges; a diver.
   1913 Webster
   A long solid cylinder, used, instead of a piston or bucket, as a forcer in pumps.
   1913 Webster
   One who bets heavily and recklessly on a race; a reckless speculator. [Cant]
   1913 Webster
   (Pottery) A boiler in which clay is beaten by a wheel to a creamy consistence.
   Knight.
   
   1913 Webster
   (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