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hydrogen peroxide
noun
: an unstable compound H2O2 used especially as an oxidizing and bleaching agent, an antiseptic, and a propellant
Examples of hydrogen peroxide in a Sentence
Recent Examples on the Web
Note that hydrogen peroxide can bleach color, so do the test first.
—Daley Quinn, Southern Living, 7 Dec. 2024
Even better, glosses are formulated without harsh chemicals like ammonia and hydrogen peroxide, which weaken keratin (the protein that keeps your strands strong).
—Jenna Ryu, SELF, 2 Dec. 2024
Stein recommends at least 30 seconds for the hydrogen peroxide to sanitize the sink's surface.
—Rebecca Jones, Southern Living, 23 Nov. 2024
If earwax is stubbornly caked on, adding a tiny bit of hydrogen peroxide (three-percent concentration only) to the toothbrush can help break it up.
—Julia Ries, Outside Online, 14 Nov. 2024
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Word History
First Known Use
1872, in the meaning defined above
Time Traveler
The first known use of hydrogen peroxide was
in 1872
Dictionary Entries Near hydrogen peroxide
Cite this Entry
“Hydrogen peroxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydrogen%20peroxide. Accessed 22 Dec. 2024.
Kids Definition
hydrogen peroxide
noun
: an unstable liquid compound containing hydrogen and oxygen and used especially for bleaching and as an antiseptic
Medical Definition
hydrogen peroxide
noun
: an unstable compound H2O2 used especially as an oxidizing and bleaching agent and as an antiseptic
More from Merriam-Webster on hydrogen peroxide
Nglish: Translation of hydrogen peroxide for Spanish Speakers
Britannica.com: Encyclopedia article about hydrogen peroxide
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