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.
Look for a quiet model with strong allergen control and 6 to 8 air changes per hour to support sleep quality. Ryan Brennan may 18, Kansas City Star, 18 May 2026 Dirty filters can cause allergies by circulating dust, mold, and other allergens throughout your home when the AC is on during the summer. Hiranmayi Srinivasan, Better Homes & Gardens, 17 May 2026 Mattresses, rugs, carpets, and upholstered couches and chairs are also reservoirs for allergens. Jennifer Prince, Southern Living, 16 May 2026 Histamine is a chemical compound naturally produced by immune cells, including mast cells, in response to a threat like an allergen. Kara Smythe, EverydayHealth.com, 15 May 2026 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 24 May. 2026.

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

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