[an-ti-juhn, -jen]
Immunology. any substance that can stimulate the production of antibodies and combine specifically with them.
Pharmacology. any commercial substance that, when injected or absorbed into animal tissues, stimulates the production of antibodies.
antigens of a particular type collectively.

1905–10; anti(body) + -gen

antigenic [an-ti-jen-ik] , adjective
antigenically, adverb
antigenicity [an-ti-juh-nis-i-tee] , noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
antigen (ˈæntɪdʒən, -ˌdʒɛn)
a substance that stimulates the production of antibodies
[C20: from anti(body) + -gen]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"substance that causes production of an antibody," 1908, from Ger., from Fr. antigène (1899), from anti- + Gk. gennan "to produce."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

antigen an·ti·gen (ān'tĭ-jən)
Any of various substances, including toxins, bacteria, and the cells of transplanted organs, that when introduced into the body stimulate the production of antibodies. Also called allergen, immunogen.

an'ti·gen'ic (-jěn'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
antigen   (ān'tĭ-jən)  Pronunciation Key 
A substance that stimulates the production of an antibody when introduced into the body. Antigens include toxins, bacteria, viruses, and other foreign substances. Compare antibody. See Note at blood type.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The rotavirus antigen test detects rotavirus in the feces.
One gram of the antigen can supply millions of vaccine shots.
Humoral immune responses result in the production of antibodies that are
  specific to a foreign antigen.
Whether the antigen is introduced via injection vs natural exposure is
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