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
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.
Pour or spray hydrogen peroxide over the baking soda. Daley Quinn, Southern Living, 14 Aug. 2025 Rather than drive him to urgent care, Belly nearly brings Con to his knees with a splash of hydrogen peroxide. Kathleen Walsh, Vulture, 13 Aug. 2025 If something has the tenacity to stick around even after that, time to bring back our friend hydrogen peroxide. Julia Forbes, Wired News, 3 Aug. 2025 By capturing these electrons, the CO2 helps protect hydrogen peroxide from being broken apart by further impacts or reactions. Victoria Corless, Space.com, 23 July 2025 See All Example Sentences for hydrogen peroxide

Word History

First Known Use

1872, in the meaning defined above

Time Traveler
The first known use of hydrogen peroxide was in 1872

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Cite this Entry

“Hydrogen peroxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydrogen%20peroxide. Accessed 1 Sep. 2025.

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

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