antigen

[an-ti-juhn, -jen]
noun
1.
Immunology. any substance that can stimulate the production of antibodies and combine specifically with them.
2.
Pharmacology. any commercial substance that, when injected or absorbed into animal tissues, stimulates the production of antibodies.
3.
antigens of a particular type collectively.

Origin:
1905–10; anti(body) + -gen

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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

antigen
"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)
n.
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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American Heritage
Cultural Dictionary
antigens [(an-ti-juhnz)]

Substances that are foreign to the body and cause the production of antibodies. Toxins, invading bacteria and viruses, and the cells of transplanted organs can all function as antigens.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
But the layers can be alternated to any thickness desired, and inconvenient
  antigens thus hidden from view.
They will be able to create diseases that change antigens frequently thus never
  giving our immune system time to adapt.
As humans age, he noted, our immune systems are exposed to all sorts of
  infections to which our bodies develop specific antigens.
These harmful substances have proteins called antigens on their surfaces.
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