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.
Some also tout hydrogen peroxide footbaths for removing toxins such as heavy metals from the body. Carrie Teegardin, AJC.com, 8 June 2026 To neutralize the skunk oil, use 1 quart of hydrogen peroxide, ¼ cup of baking soda and 2 teaspoons of dish soap. Ernie Cowan, San Diego Union-Tribune, 7 June 2026 Cosco recommends creating your own cleaning product by mixing equal parts hydrogen peroxide and water in a bowl or a spray bottle. Better Homes & Gardens, 7 June 2026 Some cleaners like bleach can break down and degrade caulk, so stick to gentler, safer, non-toxic options that kill mold spores, like vinegar or hydrogen peroxide. Karen Brewer Grossman, Southern Living, 3 June 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 20 Jun. 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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