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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Whitening strips blend both the natural process of oil pulling with hydrogen peroxide to safely and effectively release oxygen and hydroxyl free radicals for a brighter, whiter smile in as soon as 14 days. ABC News, 1 May 2026 The molecule is activated with hydrogen peroxide, and the micromotors move the particle at 7 micrometers per second. Ameya Paleja, Interesting Engineering, 27 Apr. 2026 Basics like white vinegar, baking soda, and hydrogen peroxide help tackle everyday messes. Shagun Khare, The Spruce, 26 Apr. 2026 This uses a chemical solution of 2% hydrogen peroxide with the abrasive calcium pyrophosphate to whiten your teeth. Bestreviews, Chicago Tribune, 24 Apr. 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 6 May. 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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