agonist
noun
- one who takes part in a struggle, as a main character in a drama
- a muscle whose action on a joint or orifice is opposed by the action of another muscle, the antagonist
See agonist in American Heritage Dictionary 4
(ăgˈə-nĭst)
noun- One involved in a struggle or competition.
- Physiology A contracting muscle that is resisted or counteracted by another muscle, the antagonist.
- Biochemistry A drug or other chemical that can combine with a receptor on a cell to produce a physiologic reaction typical of a naturally occurring substance.
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