allergen

noun

al·​ler·​gen ˈa-lər-jən How to pronounce allergen (audio)
: a substance (such as pollen) that induces allergy
allergenic adjective
allergenicity noun

Examples of allergen in a Sentence

common allergens, such as pollen
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
This can lead to unpleasant odors, allergens, and more. Patricia Shannon, Better Homes & Gardens, 1 Apr. 2025 The lightweight vacuum provides quick and easy cleaning to keep outdoor allergens in check. Toni Sutton, People.com, 29 Mar. 2025 The nano-ion technology at the heart of the new budget-friendly monitors draws air into vents at the rear, and is claimed capable of removing up to 90% of airborne dust in just three hours – along with pollen, allergens and other pollutants. Paul Ridden, New Atlas, 15 Mar. 2025 According to the Food and Drug Administration (FDA), the nine major food allergens in the U.S. are eggs, milk, fish, wheat, soybeans, Crustacean shellfish, sesame, tree nuts and peanuts. Thomas G. Moukawsher, Newsweek, 20 Mar. 2025 See All Example Sentences for allergen

Word History

Etymology

borrowed from German Allergen,, blend of allerg- (in Allergie allergy) and -gen (in Antigen antigen)

Note: See note at allergy.

First Known Use

circa 1907, in the meaning defined above

Time Traveler
The first known use of allergen was circa 1907

Browse Nearby Words

Cite this Entry

“Allergen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/allergen. Accessed 7 Apr. 2025.

Kids Definition

allergen

noun
al·​ler·​gen ˈal-ər-jən How to pronounce allergen (audio)
: a substance (as pollen) that causes allergy
allergenic adjective

Medical Definition

allergen

noun
al·​ler·​gen ˈal-ər-jən How to pronounce allergen (audio)
: a substance that induces allergy
inhaled allergens
a suspected food allergen

More from Merriam-Webster on allergen

Last Updated: - Updated example sentences
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