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
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This powerful paste can be made by combining baking soda and water or baking soda and hydrogen peroxide. Aliyah Rodriguez, The Spruce, 8 Apr. 2026 Also, be careful using products like hydrogen peroxide, which can discolor the fabric. Bridget Reed Morawski, Architectural Digest, 2 Apr. 2026 Make a paste of two parts baking soda with one part hydrogen peroxide. Melissa Locker, Southern Living, 15 Mar. 2026 To save them, remove the mold by washing them thoroughly with water to remove surface fungi, then spray them with a diluted solution of hydrogen peroxide (1 part hydrogen peroxide to 2 parts water). Sj McShane, Martha Stewart, 13 Mar. 2026 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 17 Apr. 2026.

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

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