Allergen

Pronunciation: /ˈælərdʒən/

Allergen (noun)

  1. A substance that can trigger an allergy in some people, causing symptoms such as sneezing, itching, or swelling.
  2. A substance in air, dust, or plants that may cause allergy symptoms in people who are sensitive to it.

Examples

  • Dust can be a cause of allergy for many people.
  • Milk is a cause of allergy for some children.