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.
Unless recommended by your healthcare provider, avoid strong ingredients like hydrogen peroxide or rubbing alcohol, as these can inflame and irritate the skin further. Lisa Desantis, Glamour, 30 July 2025 Thanks to advances in technology, many whitening strips are now formulated to be gentler on enamel, and some even use natural ingredients instead of hydrogen peroxide. Iman Balagam, Vogue, 26 July 2025 Later, the James Webb Space Telescope (JWST) noticed elevated levels of hydrogen peroxide in unexpected areas on the Jovian satellite. Victoria Corless, Space.com, 23 July 2025 When the honeys were heated to destroy hydrogen peroxide, many retained strong non-peroxide antimicrobial activity. New Atlas, 29 June 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

Browse Nearby Words

Cite this Entry

“Hydrogen peroxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hydrogen%20peroxide. Accessed 6 Aug. 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

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!