Science Dictionary
agonist   (āg'ə-nĭst)  Pronunciation Key 
  1. A muscle that actively contracts to produce a desired movement.

  2. A chemical substance, especially a drug, that can combine with a receptor on a cell to produce a physiologic response. Compare antagonist.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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