Webster's English Dictionary

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agonist

ag.o.nist \'ag-*-n*st\ n [LL agonista competitor, fr. Gk ago-niste-s, fr. 
   ago-ni] [back-formation fr. antagonist]zesthai to contend, fr. ago-n 1: one 
   that is engaged in a struggle  2: a muscle that is checked and controlled 
   by the opposing simultaneous con traction of another muscle