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

Turmeric has been widely studied for its anti-inflammatory, antioxidant, and disease-preventing benefits.1514 8. —Jamie Johnson, Verywell Health, 8 Apr. 2025

If antioxidants are good for cancers, then boosting reactive oxygen molecules might fight some kinds of metastasis. —Amber Dance, Smithsonian Magazine, 4 Apr. 2025

That's likely because of its star ingredient, thyme, which is rich in antioxidants and boasts antibacterial, antiviral and anti-inflammatory properties. —Vicky Hallett, NPR, 1 Apr. 2025

Wellness shots containing ingredients like turmeric, ginger, and honey offer a quick boost of vitamins and antioxidants to support your health. —Chelsea Rae Bourgeois, Rdn, Ld, Health, 26 Mar. 2025

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