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.
Baking Soda and Hydrogen Peroxide A paste made from baking soda and hydrogen peroxide is suitable for removing everyday grime and stains. Quincy Bulin, Southern Living, 14 May 2025 Consider buying items like bandages and hydrogen peroxide in bulk and assemble your own kits. Malaka Gharib, NPR, 7 May 2025 Mixing water with 3% hydrogen peroxide can also help keep a humidifier's surfaces clean. Lindsay Curtis, Health, 11 Apr. 2025 It's made without hydrogen peroxide, instead relying on concentrated lemon extract and chamomile to subtly lighten strands. Jamie Ballard, Allure, 2 Jan. 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 5 Jun. 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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