Medical Dictionary

allergen al·ler·gen (āl'ər-jən)

  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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