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

What the research actually says Cloves are rich in antioxidants, compounds that reduce oxidative stress, which can contribute to inflammation and chronic disease. — Hanna Wickes, Kansas City Star, 21 Oct. 2026

Research indexed by the National Institutes of Health finds that cloves are rich in antioxidants, compounds that reduce oxidative stress, a contributor to inflammation and chronic disease, and that cloves contain important vitamins and minerals. — Hanna Wickes, Miami Herald, 21 Oct. 2026

Its formula features Concentrated Miracle Broth, antioxidant-rich Lime Tea Concentrate, and Clarity Algae to help defend against free radicals and improve discoloration. — Jenny Berg, Vogue, 19 Oct. 2026

Just a tablespoon a day delivers powerful antioxidant and anti-inflammatory benefits supporting heart health, brain function, and longevity. — ABC News, 17 Oct. 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