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English definition of “allergen”

allergen

noun [C] uk   /ˈæl.ə.dʒən/ us    /-ɚ-/ specialized
a substance that can cause an allergy (= condition of the body reacting badly to something) but is not harmful to most peoplePoisoning and allergy
(Definition of allergen from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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