Definition of allergen

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al·ler·gen  audio  (lr-jn) KEY 

NOUN:
A substance, such as pollen, that causes an allergy.
ETYMOLOGY:
German Allergen : Aller(gie), allergy ; see allergy + -gen, -gen (from French -gène; see -gen)

OTHER FORMS:
aller·genic  (-jnk) KEY (Adjective)


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