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

Because they’re dried, prunes have more concentrated antioxidants than many fresh fruits. — Lindsey Desoto, HEALTH, 4 Nov. 2026

Then there are baobab oil and grapefruit extract, which add moisture and antioxidants. — Valeriya Chupinina, Vogue, 4 Nov. 2026

Key Takeaways Omega-3 fatty acids, antioxidants, fiber, magnesium, vitamin D, and plant compounds can help regulate inflammation and support overall health. — Lana Barhum, Verywell Health, 4 Nov. 2026

To help protect cognitive function and prevent brain fog, experts recommend including enough omega-3 fatty acids and antioxidants in your diet while keeping tabs on your vitamin B12, vitamin D, and iron levels. — Tom Gavin, EverydayHealth.com, 2 Nov. 2026

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