Definition of 'agonist'

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Noun

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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