antagonist

Medical Dictionary

antagonist an·tag·o·nist (ān-tāg'ə-nĭst)
n.
Something, such as a muscle, disease, or physiological process, that neutralizes or impedes the action or effect of another.

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