noun
- a substance that causes an allergic reaction in a person or animal
Usage: usually plural or used in singular form; common in medical and scientific contexts
Examples
- Pollen is a common allergen that affects many people in spring.
- The food label lists all major allergens including peanuts and shellfish.
- Dust mites are a major household allergen for people with asthma.
- She avoids dairy products because lactose is an allergen for her.
- The doctor tested him for various allergens to identify his triggers.
- Pet dander is an allergen that can cause sneezing and itching.
- Restaurants must inform customers about potential allergens in their dishes.