allergen

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Definitions from WordNet

Noun allergen has 1 sense

allergen - any substance that can cause an allergy
--₁ is a kind of substance, matter
--₁ has particulars: ragweed pollen

Definitions from the Web

Allergen

A noun referring to a substance that causes an allergic reaction in certain individuals.

Sample sentences:

The most common allergens include pollen, dust mites, and pet dander.
She had to avoid eating seafood since it was a known allergen for her.