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Definitions of agonist:
  • noun:   (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction
  • noun:   a muscle that contracts while another relaxes
    Example: "When bending the elbow the biceps are the agonist"
  • noun:   someone involved in a contest or battle (as in an agon)
  • noun:   the principal character in a work of fiction

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