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

The lightweight formula is 95% naturally derived, blending vitamin E with antioxidant-rich apricot for hydration and free-radical protection. — Deanna Pai, Vogue, 10 July 2026

These waters are antiseptic, anti-inflammatory, and antioxidant. — Condé Nast, Condé Nast Traveler, 10 July 2026

Similarly, batana oil, which contains vitamins and antioxidants, also helps the hair stay hydrated. — Isabel Bekele, InStyle, 10 July 2026

Most of the vitamins, minerals, and antioxidants in eggs are found in the yolk. — Lauren Jarvis-Gibson july 9, Fort Worth Star-Telegram, 9 July 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