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Meaning of allergen

al•ler•gen

Pronunciation: (al'ur-jun, -jen"), [key]
— n. Immunol.
  1. any substance, often a protein, that induces an allergy: common allergens include pollen, grasses, dust, and some medications.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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