per·ox·ide
pə-ˈräk-ˌsīd 
: a compound (such as hydrogen peroxide) in which oxygen is visualized as joined to oxygen
peroxided; peroxiding
: to treat with a peroxide
especially
: to bleach (hair) with hydrogen peroxide
: having or being bleached hair
a peroxide blonde
Examples of peroxide in a Sentence
Recent Examples on the Web
Lauren David, Southern Living, 13 June 2025
Best High-Tech Whitening Kit: Snow Wireless Teeth Whitening Kit
Courtesy of brand
Snow Wireless Teeth Whitening Kit
$129
129
Type of whitening agent: Hydrogen peroxide, carbamide peroxide
Dr. Sands recommends this LED whitening kit for two reasons.
—Daley Quinn, Glamour, 11 June 2025
Lauren Valenti, Vogue, 4 Feb. 2019
Lauren O'Connor, Ms, Health, 16 Dec. 2024
The enamel-safe kit uses an LED light and peroxide gel, similar to laser whitening treatments at a dental office.
—Kaitlin Gates, Better Homes & Gardens, 21 Nov. 2024
See All Example Sentences for peroxide
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Noun
In This Article In The Kitchen In The Bathroom
In The Laundry Room
In The Bedroom
Everywhere Else
Key Takeaways
Hydrogen peroxide is a medicine cabinet staple that can treat wounds and disinfect your home.
—Lauren David, Southern Living, 13 June 2025
Best High-Tech Whitening Kit: Snow Wireless Teeth Whitening Kit
Courtesy of brand
Snow Wireless Teeth Whitening Kit
$129
129
Type of whitening agent: Hydrogen peroxide, carbamide peroxide
Dr. Sands recommends this LED whitening kit for two reasons.
—Daley Quinn, Glamour, 11 June 2025
Verb
Freshly peroxided, Mock headed to the skatepark later that day.
—Lauren Valenti, Vogue, 4 Feb. 2019
Adjective
Quality inspections scrutinize ideal acidity levels, peroxide values, and light-based analyses.8
These standards are set by the International Olive Council (IOC) and the European Commission.
—Lauren O'Connor, Ms, Health, 16 Dec. 2024
The enamel-safe kit uses an LED light and peroxide gel, similar to laser whitening treatments at a dental office.
—Kaitlin Gates, Better Homes & Gardens, 21 Nov. 2024
See All Example Sentences for peroxide
Cite this Entry
“Peroxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/peroxide. Accessed 1 Jul. 2025.
Copy CitationMedical Definition
peroxide
noun
per·ox·ide
pə-ˈräk-ˌsīd
: a compound (as hydrogen peroxide) in which oxygen is visualized as joined to oxygen
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