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 also includes natural cleaners like hydrogen peroxide and vinegar. Karen Brewer Grossman, Southern Living, 27 Sep. 2025 Try to keep both dry between uses, disinfect the brush head weekly (soaking it in hydrogen peroxide or antibacterial mouthwash will do the trick), and replace your toothbrush every three to four months. Mary Cornetta, Better Homes & Gardens, 24 Sep. 2025 Formulated without alcohol or hydrogen peroxide, the TheraBreath Whitening Fresh Breath Oral Rinse uses glucose oxidase and enzymes called papain to help break up stains and kill bad-breath-causing bacteria—all without aggravating sensitive teeth and gums. Sophia Panych, Allure, 16 Sep. 2025 Fatty acids found in oils like sunflower or olive oil are mixed with hydrogen peroxide. Kurt Knutsson, FOXNews.com, 14 Sep. 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 30 Sep. 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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