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agonist

English

  1. 🔊 (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction
  2. 🔊 a muscle that contracts while another relaxes
    “when bending the elbow the biceps are the agonist”
  3. 🔊 someone involved in a contest or battle (as in an agon)
  4. 🔊 the principal character in a work of fiction

Similar words

protagonist