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

Green tea is full of antioxidants, compounds that help protect your cells from damage and lower inflammation. — Merve Ceylan, HEALTH, 17 Sep. 2026

Olay Super Serum Body Wash for Normal Skin exfoliates with gentle beta-hydroxy acids (BHA) and leaves behind antioxidants (vitamins E and C, niacinamide) and collagen peptides to help skin stay smooth, nourished, and glowing. — Elizabeth Siegel, Allure, 17 Sep. 2026

Dried ginger usually tests higher for antioxidants than fresh ginger. — Kathleen Ferraro, Verywell Health, 15 Sep. 2026

The ingredients themselves make for a great breakfast, with fiber-rich vegetables to boost the gut, ginger and orange for immune support and antioxidant-rich carrots. — Maggie Ryan, Flow Space, 14 Sep. 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