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
Cranberries Cranberries contain the antioxidant proanthocyanidin, which may help lower blood pressure and improve heart health.
—
Stephanie Brown, Verywell Health, 19 Sep. 2025
The formula, which is available now, uses ergothioneine, an amino acid and antioxidant, typically derived from mushrooms, to improve Vitamin C’s performance.
—Adam Hurly, Robb Report, 18 Sep. 2025
And with a boost of antioxidants from La Roche-Posay’s signature thermal spring water, the face serum makes skin more resilient, protecting it from free radicals and environmental aggressors alike.
—Danielle Cohen, Glamour, 18 Sep. 2025
But experts consistently recommend berries for their satiating fiber, low sugar content, and powerful antioxidant and anti-inflammatory properties—all of that can set you up for a great day ahead, and better health in the long term.
—Stephanie Anderson Witmer, Health, 18 Sep. 2025
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Stephanie Brown, Verywell Health, 19 Sep. 2025
The formula, which is available now, uses ergothioneine, an amino acid and antioxidant, typically derived from mushrooms, to improve Vitamin C’s performance.
—Adam Hurly, Robb Report, 18 Sep. 2025
And with a boost of antioxidants from La Roche-Posay’s signature thermal spring water, the face serum makes skin more resilient, protecting it from free radicals and environmental aggressors alike.
—Danielle Cohen, Glamour, 18 Sep. 2025
But experts consistently recommend berries for their satiating fiber, low sugar content, and powerful antioxidant and anti-inflammatory properties—all of that can set you up for a great day ahead, and better health in the long term.
—Stephanie Anderson Witmer, Health, 18 Sep. 2025
See All Example Sentences for antioxidant
Cite this Entry
“Antioxidant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/antioxidant. Accessed 24 Sep. 2025.
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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