English

Definition of allergen noun from the Oxford Advanced Learner's Dictionary

 

allergen

 noun
noun
BrE BrE//ˈælədʒən//
 
; NAmE NAmE//ˈælərdʒən//
 
 
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a substance that causes an allergy Word Origin early 20th cent.: blend of allergy and -gen.
See the Oxford Advanced American Dictionary entry: allergen