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allergen
 

Definitions from WordNet

Noun allergen has 1 sense
  1. 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:

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