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

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

Sulforaphane in broccoli sprouts, cabbage, and kale activates phase II detoxification enzymes and antioxidants that rapidly break down toxins and fight oxidative stress. —Dr. Sharon Bergquist, TIME, 25 Mar. 2025

With a blend of melatonin, peptides, and antioxidants, the Spanish formula has a stamp of approval from celebrity esthetician Taylor Worden. —Jenny Berg, Vogue, 25 Mar. 2025

Free radicals are linked to cellular damage and oxidative stress, an imbalance between free radicals and antioxidants in the body. —Kristen Rogers, CNN, 25 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