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

Curcumin Curcumin is the natural bioactive compound in turmeric, with antioxidant and anti-inflammatory properties. —Melissa Nieves, Verywell Health, 2 May 2025

Nutritionists back mushroom coffee's health benefits due to its high antioxidant content. —Angelica Stabile, FOXNews.com, 1 May 2025

Rosemary oil: Rosemary is an herb with antioxidant and anti-inflammatory properties. —Carrie Madormo, Rn, Health, 30 Apr. 2025

Plant oils and butter provide fatty acids, antioxidants, and phytonutrients that the skin can absorb and use, unlike mineral oils, which sit on the skin’s surface and offer no real nourishment. —Xandra Harbet, USA Today, 26 Apr. 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