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.
Allergen detection potential The study also highlighted the technology’s ability to detect allergen-containing foods. Aamir Khollam, Interesting Engineering, 17 June 2026 There was the soft cheese recall over listeria concerns and then over 500,000 boxes of mac and cheese were recalled for failing to list allergens. Melissa Locker, Southern Living, 17 June 2026 More than 500,000 packages of macaroni and cheese sold at Aldi have been recalled over a potentially undeclared allergen. James Powel, USA Today, 15 June 2026 Our products are certified organic, allergen-free, nutrient-dense. Dave Knox, Forbes.com, 11 June 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 22 Jun. 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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