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
These herbs are similar nutritionally to other leafy vegetables, brimming with vitamins A, C and K, and plant compounds called polyphenols that have antioxidant and anti-inflammatory properties.
—
Ellie Krieger, Washington Post, 24 Mar. 2026
The 2025 Readers' Choice Award winner uses the brand’s Moisture Wrap technology—hyaluronic acid and minerals that lock hydration in place—along with its Berry Mix Complex that’s rich in antioxidants, to soften rough, flaky lips.
—Christa Joanna Lee, Allure, 22 Mar. 2026
Calcium is important for bone strength and nerve signaling, manganese helps support metabolism and antioxidant defenses, copper plays a role in iron metabolism and energy production and selenium is essential for thyroid function and immune health.
—Daryl Austin, USA Today, 21 Mar. 2026
Plus, it’s enriched with vitamin C, a powerful antioxidant that can brighten the skin over time.
—Jessie Quinn, StyleCaster, 18 Mar. 2026
See All Example Sentences for antioxidant
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Ellie Krieger, Washington Post, 24 Mar. 2026
The 2025 Readers' Choice Award winner uses the brand’s Moisture Wrap technology—hyaluronic acid and minerals that lock hydration in place—along with its Berry Mix Complex that’s rich in antioxidants, to soften rough, flaky lips.
—Christa Joanna Lee, Allure, 22 Mar. 2026
Calcium is important for bone strength and nerve signaling, manganese helps support metabolism and antioxidant defenses, copper plays a role in iron metabolism and energy production and selenium is essential for thyroid function and immune health.
—Daryl Austin, USA Today, 21 Mar. 2026
Plus, it’s enriched with vitamin C, a powerful antioxidant that can brighten the skin over time.
—Jessie Quinn, StyleCaster, 18 Mar. 2026
See All Example Sentences for antioxidant
Cite this Entry
“Antioxidant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/antioxidant. Accessed 26 Mar. 2026.
Copy CitationKids 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
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