Webster's English Dictionary

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caster

cast.er \'kas-t*r\ \-t*r\ n or cas.tor or castor 1: one that casts (as a 
   machine that casts type)  2a: a cruet, sifter, or other small container for 
   condiments  2b: a stand for holding casters  3: a wheel or set of wheels 
   mounted in a swivel frame used for supporting f urniture, trucks, and 
   portable machines