peroxidase
noun
per·ox·i·dase
pə-ˈräk-sə-ˌdās 
-ˌdāz
: an enzyme that catalyzes the oxidation of various substances by peroxides
Examples of peroxidase in a Sentence
Recent Examples on the Web
This polyphenol not only gives turmeric its bright yellow color but also combats free radicals and boosts the body's defense system by activating antioxidant enzymes like superoxide dismutase and glutathione peroxidase.
—
Lana Barhum, Verywell Health, 13 May 2026
The defense relies on hydrogen peroxide, hydroquinone and a suite of highly specialized enzymes, namely catalases and peroxidases.
—Scott Travers, Forbes.com, 21 Apr. 2026
Brazil nuts Brazil nuts are one of the richest natural sources of selenium, a trace mineral essential for the production of glutathione peroxidase, a powerful antioxidant enzyme that helps neutralize free radicals and reduce oxidative stress.
—Lauren Manaker, SELF, 4 Mar. 2026
The microneedle surface is coated with a thin layer of gold, mixed with a bio-hydrogel composed of biocompatible and hydrophilic chitosan and horseradish peroxidase enzymes.
—Mack Degeurin, Popular Science, 19 Mar. 2025
Antioxidant enzymes like glutathione peroxidase in selenium help protect liver cells from damage by reducing unstable oxygen molecules.
—Devineé Lingo, M.s., Rdn, Health, 9 Sep. 2024
The horseradish peroxidase reaction’s byproduct then turns the solution red.
—IEEE Spectrum, 5 June 2014
Erythrocyte reduced glutathione levels, erythrocyte glutathione peroxidase and superoxide dismutase activities were significantly increased in the rats kept in the pyramid as compared to the other two groups.
—Ncbi Rofl, Discover Magazine, 22 Feb. 2012
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Lana Barhum, Verywell Health, 13 May 2026
The defense relies on hydrogen peroxide, hydroquinone and a suite of highly specialized enzymes, namely catalases and peroxidases.
—Scott Travers, Forbes.com, 21 Apr. 2026
Brazil nuts Brazil nuts are one of the richest natural sources of selenium, a trace mineral essential for the production of glutathione peroxidase, a powerful antioxidant enzyme that helps neutralize free radicals and reduce oxidative stress.
—Lauren Manaker, SELF, 4 Mar. 2026
The microneedle surface is coated with a thin layer of gold, mixed with a bio-hydrogel composed of biocompatible and hydrophilic chitosan and horseradish peroxidase enzymes.
—Mack Degeurin, Popular Science, 19 Mar. 2025
Antioxidant enzymes like glutathione peroxidase in selenium help protect liver cells from damage by reducing unstable oxygen molecules.
—Devineé Lingo, M.s., Rdn, Health, 9 Sep. 2024
The horseradish peroxidase reaction’s byproduct then turns the solution red.
—IEEE Spectrum, 5 June 2014
Erythrocyte reduced glutathione levels, erythrocyte glutathione peroxidase and superoxide dismutase activities were significantly increased in the rats kept in the pyramid as compared to the other two groups.
—Ncbi Rofl, Discover Magazine, 22 Feb. 2012
Cite this Entry
“Peroxidase.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/peroxidase. Accessed 20 May. 2026.
Copy CitationMedical Definition
peroxidase
noun
per·ox·i·dase
pə-ˈräk-sə-ˌdās, -ˌdāz
: an enzyme occurring especially in plants, milk, and white blood cells and consisting of a protein complex with hematin groups that catalyzes the oxidation of various substances by peroxides
Love words? Need even more definitions?
Merriam-Webster unabridged
