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Noun: antagonist  an'ta-gu-nist
  1. Someone who offers opposition
    - adversary, opponent, opposer, resister
  2. A muscle that relaxes while another contracts
    "when bending the elbow the triceps are the antagonist"
  3. A drug that neutralizes or counteracts the effects of another drug

Derived forms: antagonists

Type of: antagonistic muscle, drug, individual, mortal, person, somebody, someone, soul

Antonym: agonist, synergist

Encyclopedia: Antagonist