Medical Dictionary

agonist ag·o·nist (āg'ə-nĭst)

  1. A contracting muscle that is resisted or counteracted by an antagonistic muscle.

  2. A substance that can combine with a cell receptor to produce a reaction typical for that substance.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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