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Noun: agonist  a-gu-nist
  1. The principal character in a work of fiction
    - protagonist
     
  2. Someone involved in a contest or battle (as in an agon)
     
  3. A muscle that contracts while another relaxes
    "when bending the elbow the biceps are the agonist"
     
  4. (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction

Derived forms: agonists

Type of: antagonistic muscle, character, contestant, drug, fictional character, fictitious character

Antonym: antagonist

Encyclopedia: Agonist