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Allergen

//ˈælə(ɹ)ˌd͡ʒɛn// noun

Definitions

Noun
  1. 1
    A substance which causes an allergic reaction.

    "Pollen, dust, and spores are common allergens."

  2. 2
    any substance that can cause an allergy wordnet

Etymology

Syncopated compound of allergy + -gen, coined on the model of pharmaceutical words such as pathogen and antigen.

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