Definition of Allergen

something that leads to an allergic reaction

Examples of Allergen in a sentence

Pollen is a common allergen for people because the yellow dust causes them to get cold-like symptoms.  

Since Tiffany can’t eat peanuts, her immune system is not strong enough to stop the allergen from giving her a fever.  

Many people think they are allergic to cats because they will get sick around them, but actually the cat’s fur is the actual allergen.  

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