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allergen

[al-er-juh n, -jen] /ˈæl ər dʒən, -ˌdʒɛn/
noun, Immunology
1.
any substance, often a protein, that induces an allergy: common allergens include pollen, grasses, dust, and some medications.
Origin of allergen
1910-1915
1910-15; aller(gy) + -gen
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for allergen

allergen

/ˈæləˌdʒɛn/
noun
1.
any substance capable of inducing an allergy
Derived Forms
allergenic, adjective
allergenicity, noun
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 allergen
n.

substance causing allergy, 1912, from allergy on model of antigen.

Online Etymology Dictionary, © 2010 Douglas Harper
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allergen in Medicine

allergen al·ler·gen (āl'ər-jən)
n.

  1. A substance, such as pollen, that causes an allergy.

  2. See antigen.


al'ler·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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allergen in Science
allergen
  (āl'ər-jən)   
A substance, such as pollen, that causes an allergic reaction.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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