Webster's English Dictionary

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plunger

plung.er \'pl*n-j*r\ n : one that plunges : as  : DIVER  : a reckless 
   gambler or speculator  : the rod carrying the valves in the inner assembly 
   of an automobile tire  valve unit : a sliding reciprocating piece driven by 
   or against fluid pressure;  esp : PISTON : a piece with a motion more or 
   less like that of a ram or piston  : a rubber suction cup on a handle used 
   to free plumbing traps and waste  outlets of obstructions