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antagonist

 
Noun antagonist has 3 senses
  1. adversary, antagonist, opponent, opposer, resister - someone who offers opposition
    --1 is a kind of person, individual, someone, somebody, mortal, human, soul
    Antonyms: agonist
    --1 has particulars:
     dueler, dueller, duelist, duellist; enemy, foe, foeman, opposition; Luddite; withstander; Antichrist
  2. antagonist - a muscle that relaxes while another contracts; "when bending the elbow the triceps are the antagonist"
    --2 is a kind of
    antagonistic muscle
  3. antagonist - a drug that neutralizes or counteracts the effects of another drug
    --3 is a kind of
    drug
    Antonyms: synergist
    --3 has particulars: estrogen antagonist, tamoxifen; narcotic antagonist
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