Agonist

//ˈæ.ɡɘ.nɪst// noun

Definitions

Noun
  1. 1
    Someone involved in a contest or battle (as in an agon), protagonist.
  2. 2
    (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction wordnet
  3. 3
    The muscle that contracts while the other relaxes.

    "When bending the elbow, the biceps is the agonist."

  4. 4
    a muscle that contracts while another relaxes wordnet
  5. 5
    A molecule that can combine with a receptor on a cell to produce a physiological reaction.

    "Acetylcholine is an agonist at the cholinergic receptor."

Show 2 more definitions
  1. 6
    someone involved in a contest or battle (as in an agon) wordnet
  2. 7
    the principal character in a work of fiction wordnet

Etymology

Borrowed from Latin agōnista, from Ancient Greek ἀγωνιστής (agōnistḗs, “combatant, champion”). By surface analysis, agon or agony + -ist.

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