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 serum combines biomimetic peptides, a root-anchoring complex, and antioxidants to fortify hair on multiple, overlapping fronts. — Kate Gammon, Time, 15 Oct. 2026

Peanut butter contains vitamin E, which acts as an antioxidant in the body, as well as magnesium, which plays a role in muscle and nerve function. — Trista Chan, HEALTH, 12 Oct. 2026

Berries Collen also points to antioxidants, which are known to support cognitive function. — Audrey Noble, Vogue, 9 Oct. 2026

The compound also acts as a potent antioxidant, neutralizing unstable molecules that build up in non-healing wounds and cause cellular damage. — Abhimanyu Ghoshal, New Atlas, 7 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