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Definition of 'agonist'


  1. the principal character in a work of fiction
       Synonyms: protagonist
  2. someone involved in a contest or battle (as in an agon)
       Antonyms: adversary antagonist opponent opposer resister
  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

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