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

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Other Words from antioxidant

antioxidant adjective

Examples of antioxidant in a Sentence

Recent Examples on the Web Can support a healthy immune system: Just one medium zucchini provides over half your day's worth of vitamin C, an important antioxidant and water-soluble vitamin that plays a major role in immune function. Stefani Sassos, Ms, Rdn, Cso, Good Housekeeping, 28 Apr. 2021 Lycopene, which works as an antioxidant, may protect against cancer by preventing cell damage in the body. Darlene Zimmerman, Detroit Free Press, 29 May 2021 Vitamin C is a superstar antioxidant particularly in skin care preparations but it has been known to gently lift hair color as well. Bea Mcmonagle, Forbes, 28 May 2021 Pro-Retinol, vitamin C, and grape seed extract (a powerful dark circle-busting antioxidant) make quite the trio of antiaging power. Kaitlyn Yarborough, Southern Living, 24 May 2021 Turmeric contains a powerful antioxidant known as curcumin. Stefani Sassos, Ms, Rdn, Cso, Good Housekeeping, 22 Apr. 2021 As an antioxidant with potent anti-inflammatory properties, turmeric can promote a healthy gut by reducing inflammation and bad bacteria. Angela Watson,, 19 Mar. 2021 The powerhouse antioxidant also works to fade away hyperpigmentation. Lauren Valenti, Vogue, 3 May 2021 Vitamin C, one of the most effective nutrients, is an antioxidant that is necessary for your overall well-being. Anjana Rajbhandary,, 3 Apr. 2021

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.

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First Known Use of antioxidant

1919, in the meaning defined above

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Time Traveler for antioxidant

Time Traveler

The first known use of antioxidant was in 1919

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Statistics for antioxidant

Last Updated

17 Jun 2021

Cite this Entry

“Antioxidant.” Dictionary, Merriam-Webster, Accessed 20 Jun. 2021.

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More Definitions for antioxidant



English Language Learners Definition of antioxidant

: a substance that is added to food and other products to prevent harmful chemical reactions in which oxygen is combined with other substances


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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