an·​ti·​ox·​i·​dant | \ ˌan-tē-ˈäk-sə-dənt , 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 The wolfberry, also known as goji, is rich in zeaxanthin, an antioxidant, and a carotenoid called lutein, which can help reduce the risk of eye disease. Priscilla Totiyapungprasert, The Arizona Republic, 25 Apr. 2022 Infused with not only the antioxidant, SPF, and the conditioning ingredient French Polynesian kopara, expect a sheer, radiant finish that can help protect and even out skin tone over time. Kiana Murden, Vogue, 14 Apr. 2022 Pycnogenol, a derivative of pine trees, is the antioxidant of choice in this formula. Grooming Playbook, The Salt Lake Tribune, 5 Apr. 2022 This super potent antioxidant is also found in red grapes, peanuts and berries like blueberries and mulberries. Katie Berohn, Good Housekeeping, 9 Sep. 2021 Ascorbic acid, otherwise known as vitamin C, is another powerful antioxidant included in this formula. Grooming Playbook, The Salt Lake Tribune, 5 Apr. 2022 Glutathione is a natural antioxidant found in cells. Joshua Hawkins, BGR, 24 Mar. 2022 This elegant product is made with a miracle broth that repairs visible signs of age and lime tea that is a proprietary antioxidant. Daisy Maldonado, SELF, 17 Mar. 2022 In other words, does naturally occurring (organic) vitamin C provide an antioxidant that is helpful, while vitamin C synthesized in a laboratory is not? Bryant Stamford, The Courier-Journal, 24 Feb. 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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Time Traveler for antioxidant

The first known use of antioxidant was in 1919

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Last Updated

12 May 2022

Cite this Entry

“Antioxidant.” Dictionary, Merriam-Webster, Accessed 16 May. 2022.

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More Definitions for antioxidant


an·​ti·​ox·​i·​dant | \ ˌant-ē-ˈäk-səd-ənt, ˌan-ˌtī- \

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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