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

Definition of allergen

: a substance (such as pollen) that induces allergy

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 Creminelli Fine Meats of Salt Lake City is recalling about 4,207 pounds of ready-to-eat parmesan salami sticks due to misbranding and an undeclared allergen, the U.S. Department of Agriculture’s Food Safety and Inspection Service announced. Marc Bona, cleveland, 1 July 2022 The various flavors in those recalls contained an allergen that did not appear on the retail packaging. Chris Smith, BGR, 7 June 2022 This explains why your eyes feel itchy and your nose runs after breathing in an allergen such as pollen. Sara Gaynes Levy, SELF, 31 May 2022 Watson recommends only rinsing the vulva with water or, at most, using a gentle, low-allergen soap. Amber Ferguson, Washington Post, 31 May 2022 The avalanche of ice cream recalls continues with Casper’s Red Button Canadian Vanilla, which contains almonds, an undeclared allergen. Chris Smith, BGR, 27 May 2022 Asthma can flare up for numerous reasons, such as exercise or exposure to an allergen. Sara Gaynes Levy, SELF, 31 May 2022 Use allergen-proof bed covers which block dust mites’ access to your mattress and pillows. Terry Baddoo, USA TODAY, 21 Apr. 2022 Allergies are your body's reaction to an allergen, like pollen, pet dander, or dust. Korin Miller,, 14 Feb. 2022 See More

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.

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

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The first known use of allergen was circa 1907

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Dictionary Entries Near allergen

Allen wrench



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Statistics for allergen

Last Updated

9 Aug 2022

Cite this Entry

“Allergen.” Dictionary, Merriam-Webster, Accessed 13 Aug. 2022.

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More Definitions for allergen


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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