an·​ti·​ox·​i·​dant | \ ˌan-tē-ˈäk-sə-dənt How to pronounce antioxidant (audio) , ˌan-ˌtī- \

Definition of antioxidant

: a substance (such as beta-carotene or vitamin C) that inhibits oxidation or reactions promoted by oxygen, peroxides, or free radicals

Other Words from antioxidant

antioxidant adjective

Examples of antioxidant in a Sentence

Recent Examples on the Web Plus, it's formulated with brassica extract to reduce dark spots, arnica flower to soothe and hydrate, pullulan (a powerful antioxidant), and nourishing black quinoa to rejuvenate skin with amino acids, minerals, and vitamins. Ariel Scotti,, 5 July 2022 This high-end moisturizer features a unique ingredient, ferulic acid, which is an antioxidant that many competitors don’t include in their face creams. Grooming Playbook, The Salt Lake Tribune, 9 June 2022 Niacinamide, or vitamin B3, is another great ingredient for those with dry skin—it’s a powerful antioxidant that can help reduce hyperpigmentation and discoloration, minimize redness, and enhance hydration. Hannah Dylan Pasternak, SELF, 19 July 2022 Organic shea butter is a powerful moisturizer, manuka honey works as a mighty antioxidant, and mafura oil protects and hydrates. Grooming Playbook, The Salt Lake Tribune, 26 May 2022 Other helpful ingredients are vitamin C, an antioxidant that brightens post-acne dark spots and scars over time, and niacinamide, which works to even out skin tone and texture. Sarah Madaus, SELF, 28 June 2022 Blueberry extract, an antioxidant, provides the skin with a layer of protection. Grooming Playbook, The Salt Lake Tribune, 11 May 2022 The Retinol Eye Stick combats dark circles and any texture under the eyes with the combination of brightening astaxanthin (an antioxidant that is stronger than vitamin C) and smoothing retinol. Angela Trakoshis, Allure, 29 Apr. 2022 Or perhaps a company finds a common water contaminant causes some degree of hair damage — and then concocts an antioxidant to combat it. Jolene Edgar, Allure, 24 June 2022 See More

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

First Known Use of antioxidant

1919, in the meaning defined above

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The first known use of antioxidant was in 1919

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Last Updated

4 Aug 2022

Cite this Entry

“Antioxidant.” Dictionary, Merriam-Webster, Accessed 14 Aug. 2022.

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More Definitions for antioxidant


an·​ti·​ox·​i·​dant | \ ˌant-ē-ˈäk-səd-ənt, ˌan-ˌtī- How to pronounce antioxidant (audio) \

Medical Definition of antioxidant

: any of various substances (as beta-carotene, vitamin C, and alpha-tocopherol) that inhibit oxidation or reactions promoted by oxygen and peroxides and that include many held to protect the living body from the deleterious effects of free radicals

Other Words from antioxidant

antioxidant adjective

More from Merriam-Webster on antioxidant

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


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