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

And cauliflower is great for your health: Full of fiber, cancer-fighting antioxidants, vitamins and folate. —Melissa Oyler, Charlotte Observer, 14 Jan. 2025

Star fruit is an impressive source of antioxidants and fiber, which promote gut health and immune function.1 The combination of fruits provides vitamins and minerals, while yogurt or milk adds healthy fats and protein. 4. —Chelsea Rae Bourgeois, Rdn, Ld, Health, 13 Jan. 2025

In short, acorns are packed with nutrients and antioxidants, Balls says. —Hannah Yasharoff, USA TODAY, 12 Jan. 2025

What This Means For You Broccoli is packed with antioxidants, vitamins, and minerals. —Maggie O'Neill, Verywell Health, 11 Jan. 2025

Word History

First Known Use

1919, in the meaning defined above

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