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 antagonist \an*tag"o*nist\ ([a^]n*t[a^]g"[-o]*n[i^]st), n. [L.
   antagonista, Gr. 'antagwnisth`s; 'anti` against + 'agwnisth`s
   combatant, champion, fr. 'agwni`zesqai: cf. F. antagoniste.
   See {Antagonism}.]
   1. One who contends with another, especially in combat; an
      adversary; an opponent.
      [1913 Webster]

            Antagonist of Heaven's Almighty King. --Milton.
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            Our antagonists in these controversies. --Hooker.
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   2. (Anat.) A muscle which acts in opposition to another; as a
      flexor, which bends a part, is the antagonist of an
      extensor, which extends it. AS
      [1913 Webster]

   3. (Med.) A substance which opposes the actions of another
      substance in the body, especially a drgu that counteracts
      the effects of another drug.
      [1913 Webster + AS]

   Syn: Adversary; enemy; opponent; foe; competitor. See
        {Adversary}.
        [1913 Webster]