Meaning of antagonist

an•tag•o•nist

Pronunciation: (an-tag'u-nist), [key]
— n.
  1. a person who is opposed to, struggles against, or competes with another; opponent; adversary.
  2. the adversary of the hero or protagonist of a drama or other literary work: Iago is the antagonist of Othello.
  3. a muscle that acts in opposition to another. Cf. agonist (def. 3).
  4. a tooth in one jaw that articulates during mastication or occlusion with a tooth in the opposing jaw.
  5. a drug that counteracts the effects of another drug.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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