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Noun agonist has 4 senses
  1. protagonist, agonist - the principal character in a work of fiction
    --1 is a kind of fictional character, fictitious character, character
    --1 has particulars: antihero
  2. agonist - someone involved in a contest or battle (as in an agon)
    --2 is a kind of
    Antonyms: adversary, antagonist, opponent, opposer, resister
  3. agonist - a muscle that contracts while another relaxes; "when bending the elbow the biceps are the agonist"
    --3 is a kind of
    antagonistic muscle
  4. agonist - (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction
    --4 is a kind of
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