antioxidant

noun

an·​ti·​ox·​i·​dant ˌan-tē-ˈäk-sə-dənt 

ˌan-ˌtī-

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

antioxidant adjective

Examples of antioxidant in a Sentence

Recent Examples on the Web

Sorghum Sorghum is a nutritious, gluten-free grain rich in magnesium, B vitamins, and antioxidants, including phenolic compounds. —Jillian Kubala, Health, 21 Apr. 2025

After the experiment, concentrations of antioxidants (especially glutathione) were found to have increased during exposure. —Elizabeth Rayne, ArsTechnica, 19 Apr. 2025

That might look like a tailored routine of prescription topicals, gentle exfoliants, antioxidants, and religious sunscreen use of at least SPF 30 Does melasma go away on its own? —Christa Joanna Lee, Allure, 15 Apr. 2025

Famous for its tangy, sour, and slightly salty taste, sauerkraut has long been noted for being both nutritious and healthy, having been tied to a host of anti-inflammatory, antioxidant, and anti-carcinogenic activities. —Sam Walters, Discover Magazine, 15 Apr. 2025

Word History

First Known Use

1919, in the meaning defined above

Rhymes for antioxidant

• oxidant

Kids Definition

antioxidant

noun

an·​ti·​ox·​i·​dant ˌant-ē-ˈäk-səd-ənt 

ˌan-ˌtī-

: a substance that opposes oxidation or prevents or makes difficult reactions made easier by oxygen

Medical Definition

antioxidant

noun

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

: 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

antioxidant adjective