al·​ler·​gen | \ ˈa-lər-jən How to pronounce allergen (audio) \

Definition of allergen

: a substance (such as pollen) that induces allergy

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Other Words from allergen

allergenic \ ˌa-​lər-​ˈje-​nik How to pronounce allergen (audio) \ adjective
allergenicity \ ˌa-​lər-​jə-​ˈni-​sə-​tē How to pronounce allergen (audio) \ noun

Examples of allergen in a Sentence

common allergens, such as pollen
Recent Examples on the Web Only a small number of top allergen-free food manufacturers are in the United States. Geri Stengel, Forbes, "Black Female Founder Attracts Venture Capital With Allergen-Free Snacks," 28 Apr. 2021 Luckily, rashes caused by allergies can often be treated from the comfort of your own home, and some might clear up as soon as the allergen is removed from your environment. Maggie O'neill,, "3 Common Allergy Rashes—and What They Look Like," 27 Apr. 2021 This might not be a problem in some cases, but because SnoBalls use coconut, and coconut can be a severe allergen for some individuals, the recall had to be issued. Mike Wehner, BGR, "If you bought this delicious snack, don’t eat it," 15 Apr. 2021 Mold is a more common allergen from mid-summer to early fall. Hannah Kirby, Milwaukee Journal Sentinel, "Spring pollen has arrived in Wisconsin. Here's how to tell the difference between COVID-19 and allergies," 14 Apr. 2021 Our year of learning and worrying about an unfamiliar airborne pathogen has readied us for a familiar airborne allergen. Jacob Stern, The Atlantic, "The Other Reason You Might Feel Terrible Right Now," 1 Apr. 2021 The products’ ingredient label does not state the wheat allergen, Ohio Department of Agriculture said in a release. Marc Bona, cleveland, "b.a. Sweetie issues recall for some chocolate malt-ball products in Cleveland," 26 Mar. 2021 Reactions depend on how much of an allergen someone is exposed to along with his or her history of exposure. Scientific American, "Skin Allergy Myths Debunked," 18 Dec. 2017 The brand claims to use only sustainable and allergen-friendly ingredients, making their products suitable for consumers with sensitive skin. Laura Duerr,, "Youth To The People review: Can this overnight face mask help you achieve hydrated skin?," 2 Mar. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'allergen.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of allergen

circa 1907, in the meaning defined above

History and Etymology for allergen

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

Note: See note at allergy.

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Time Traveler for allergen

Time Traveler

The first known use of allergen was circa 1907

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Statistics for allergen

Last Updated

5 May 2021

Cite this Entry

“Allergen.” Dictionary, Merriam-Webster, Accessed 16 May. 2021.

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More Definitions for allergen



English Language Learners Definition of allergen

medical : a substance that causes an allergy


al·​ler·​gen | \ ˈa-lər-jən How to pronounce allergen (audio) \

Kids Definition of allergen

: a substance that causes an allergic reaction


al·​ler·​gen | \ ˈal-ər-jən How to pronounce allergen (audio) \

Medical Definition of allergen

: a substance that induces allergy inhaled allergens a suspected food allergen

More from Merriam-Webster on allergen

Nglish: Translation of allergen for Spanish Speakers

Britannica English: Translation of allergen for Arabic Speakers Encyclopedia article about allergen

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