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

Asparagus is a nutrient-dense vegetable that contains plenty of fiber, antioxidants, and other vitamins and minerals. —Jennifer Lefton, Verywell Health, 20 June 2025

The protein in yogurt slows digestion, while the berries provide antioxidants and just a hint of natural sweetness to satisfy your snack cravings. —Lauren Manaker Ms, Health, 19 June 2025

Using sunscreen daily, along with a powerful antioxidant (like vitamin C), is the best way to protect your skin from this type of damage. —Kristin Canning, SELF, 19 June 2025

According to a 2023 study, many hot peppers are high in antioxidants. —Matt Fuchs, Time, 17 June 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