Webster's English Dictionary

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worker

work.er \'w*r-k*r\ n 1a: one that works esp. at manual or industrial labor 
   or with a particular  material - often used in combination 1b: a member of 
   the working class  2: one of the sexually underdeveloped and usu. sterile 
   members of a colony  of social ants, bees, wasps, or termites that perform 
   most of the labor and protective duties of the colony 3: a usu. electrotype 
   plate from which printing is done