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ag·o·nist  (  g   -n  st) KEY 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.
ETYMOLOGY:Late Latin ag nista, contender, from Greek ag nist s, from ag n, contest ; see agony
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