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Definition of plunger:

  1. A boiler in which clay is beaten by a wheel to a creamy consistence.
  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.
  4. One who, or that which, plunges; a diver.
  5. The firing pin of a breechloader.


underwater diver, diver, loon, frogman, piston, speculator, plumber's helper.

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