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.
Most folks already have baking soda and hydrogen peroxide somewhere in their home, and these two products make the perfect cleaning solution for a porcelain sink. Daley Quinn, Southern Living, 17 Dec. 2025 Use a 100% saline spray, rather than hydrogen peroxide or alcohol, to keep your new piercing clean, says Teichman. Caroline C. Boyle, USA Today, 16 Dec. 2025 Let the solution sit on the stain for a few minutes to allow the hydrogen peroxide to penetrate and break down the mineral deposits. Halee Miller Van Ryswyk, Better Homes & Gardens, 16 Dec. 2025 Sheehan said officers found several bottles of hydrogen peroxide and a knife. Matt Schooley, CBS News, 8 Dec. 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 28 Dec. 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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