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3 definitions found
 for Plunger
From The Collaborative International Dictionary of English v.0.48 :

  Plunger \Plun"ger\, n.
     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]

From WordNet (r) 3.0 (2006) :

      n 1: someone who risks losses for the possibility of
           considerable gains [syn: speculator, plunger]
      2: someone who dives (into water) [syn: diver, plunger]
      3: hand tool consisting of a stick with a rubber suction cup at
         one end; used to clean clogged drains [syn: plunger,
         plumber's helper]
      4: mechanical device that has a plunging or thrusting motion
         [syn: piston, plunger]

From Moby Thesaurus II by Grady Ward, 1.0 :

  47 Moby Thesaurus words for "plunger":
     adventurer, betting ring, bettor, big operator, boneshaker,
     cardshark, cardsharp, cardsharper, compulsive gambler,
     crap shooter, deep-sea diver, diver, free diver, frogman, gambler,
     gamester, gunslinger, hazarder, jumper, lame duck,
     margin purchaser, operator, parachute jumper, pearl diver,
     petty gambler, piker, player, punter, scalper, scuba diver, sharp,
     sharper, sharpie, skin diver, sky diver, smart operator,
     snorkel diver, speculator, sport, sporting man, sportsman, stag,
     tinhorn, tipster, tout, venturer, wagerer

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