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antagonist

[an-tag-uh-nist] /ænˈtæg ə nɪst/
noun
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.
Physiology. a muscle that acts in opposition to another.
Compare agonist (def 3).
4.
Dentistry. a tooth in one jaw that articulates during mastication or occlusion with a tooth in the opposing jaw.
5.
Pharmacology. a drug that counteracts the effects of another drug.
Origin
1590-1600
1590-1600; < Late Latin antagōnista < Greek antagōnistḗs. See antagonize, -ist
Can be confused
antagonist, proponent, protagonist.
Synonyms
1. contestant, enemy, foe. See adversary.
Antonyms
1. ally, friend.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ant-agonist

antagonist

/ænˈtæɡənɪst/
noun
1.
an opponent or adversary, as in a contest, drama, sporting event, etc
2.
any muscle that opposes the action of another Compare agonist (sense 1)
3.
a drug that counteracts the effects of another drug Compare synergist (sense 1)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ant-agonist

antagonist

n.

1590s, from French antagoniste (16c.) or directly from Late Latin antagonista, from Greek antagonistes "competitor, opponent, rival," agent noun from antagonizesthai "to struggle against, oppose, be a rival," from anti- "against" (see anti-) + agonizesthai "to contend for a prize," from agon "contest" (see agony). Originally in battle or sport, extended 1620s to any sphere of human activity.

Online Etymology Dictionary, © 2010 Douglas Harper
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ant-agonist in Medicine

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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ant-agonist in Science
antagonist
  (ān-tāg'ə-nĭst)   
  1. A muscle that opposes the action of another muscle, as by relaxing while the other one contracts, thereby producing smooth, coordinated movement.

  2. A chemical substance, such as a drug, that interferes with the physiological action of another substance, especially by combining with and blocking its nerve receptor. Compare agonist.


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