antagonist Hear it!

antagonist definition

an·tago·nist (an tag′ə nist)

noun

  1. a person who opposes or competes with another; adversary; opponent
  2. a muscle, drug, etc. that acts in opposition to or counteracts another

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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