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

Hot coffee may offer slightly higher levels of antioxidants, while cold brew is often perceived as smoother and less acidic. —Christina Manian, Health, 10 June 2026

Red bell peppers contain slightly more vitamin C and antioxidants. —Vanessa Caceres, Verywell Health, 10 June 2026

Berries are packed with antioxidants, fiber and vitamin C, so his healthy eating habits should put me, the proud grandmother, in a happy place, right? —Sandee Lamotte, CNN Money, 9 June 2026

Its main ingredient, chebula, is a potent antioxidant that smooths and brightens skin. —Christina Butan, InStyle, 8 June 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