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.
The job of catalase is to break down hydrogen peroxide, which is harmful to the body in high amounts, into water and oxygen. Eric Berger, ArsTechnica, 11 Apr. 2025 Free from hydrogen peroxide, which often triggers sensitivity, this toothpaste is gentle enough for daily use. Iman Balagam, Vogue, 28 Mar. 2025 According to Knoll, the best products to use for cleaning a porcelain sink are baking soda and hydrogen peroxide. Daley Quinn, Southern Living, 21 Mar. 2025 The students in grades K-5 sat around round tables arrayed with vials of liquids including lemon juice, vinegar, ammonia, rubbing alcohol and hydrogen peroxide. Carole Carlson, Chicago Tribune, 27 Feb. 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 22 Apr. 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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