noun
- a substance that causes an allergic reaction
Usage: medical
Examples
- Peanuts are a common allergen that can cause severe reactions.
- The doctor tested her for various allergens to identify the cause of her rash.
- Pet dander is a major allergen for many people.
- Food labels must list potential allergens like eggs and milk.
- Dust mites are indoor allergens that trigger asthma symptoms.
- The restaurant has an allergen-free menu for sensitive customers.