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

Examples of allergen in a Sentence

common allergens, such as pollen

Recent Examples on the Web

If allergens are an issue, natural wine may be a better option, suggests Feiring. NBC News, "What is natural wine? And is it better for you?," 11 Aug. 2019 All recipes are free from gluten and the top eight allergens – dairy, egg, fish, crustacean, shellfish, tree nuts, peanuts, wheat and soy. Catie Wegman,, "Fort Lauderdale mom creates baking club for children with dietary restrictions," 26 July 2019 With this form of immunotherapy, your body gets acclimated to the allergen that’s tormenting you through a series of shots that increase in dosage. Marisa Cohen, Good Housekeeping, "How to Get Relief From Fall Allergies, According to an Allergist," 19 June 2019 The major allergen that effects those who suffer from cat allergies is Fel d1, which is found in the saliva of cats. Kelli Bender,, "Kitty Cure: New Research Suggests an End to Severe Cat Allergies Could Be in Sight," 17 June 2019 Dust mites, molds, and various allergens accumulate on a daily basis. Korin Miller, SELF, "13 Changes You Can Make at Home to Control Your Asthma," 31 Aug. 2018 As a bonus, the design is hypoallergenic and resistant to microbes, mites, and allergens. Kelsey Mulvey, House Beautiful, "Those Super Popular Buffy Comforters Are 30 Percent Off Today," 9 July 2019 These protectors are especially important for anyone with allergies because the fabric blocks household allergens from settling into your pillows and mattress. Lexie Sachs, Good Housekeeping, "How to Make a Bed Like a Professional, According to Bedding Experts," 28 June 2019 One of Louisville's favorite spots for fried chicken is also vegan and allergen-friendly. Maggie Menderski, The Courier-Journal, "Gluten or dairy-free? Try these 7 allergy-friendly places in Louisville," 24 June 2019

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

International Scientific Vocabulary allergy + -gen

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Statistics for allergen

Last Updated

17 Aug 2019

Look-up Popularity

Time Traveler for allergen

The first known use of allergen was circa 1907

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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

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More from Merriam-Webster on allergen

Spanish Central: Translation of allergen

Nglish: Translation of allergen for Spanish Speakers

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

Comments on allergen

What made you want to look up allergen? Please tell us where you read or heard it (including the quote, if possible).


not constant or steady

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