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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
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.
Rinse the stain with cold water, then spray it with a mixture of equal parts dish soap, hydrogen peroxide and baking soda. Cody Godwin, USA Today, 19 Nov. 2025 Bleach can also have a dangerous reaction with cleaners that contain ammonia, hydrogen peroxide, or acids like vinegar. Brandee Gruener, Southern Living, 16 Nov. 2025 This turns the water into hydrogen radicals, hydroxyl radicals, hydrated electrons, molecular hydrogen, and hydrogen peroxide, among others. New Atlas, 14 Nov. 2025 Johnston notes that hydrogen peroxide can be used on blood, red wine, pet stains, and clay mud. Jennifer Beck Goldblatt, Architectural Digest, 31 Oct. 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 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

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