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

The pens are powered by hydrogen peroxide, which leaves teeth looking visibly whiter with just one week of use. —Janice Brockenberry, Essence, 15 Oct. 2024

Its active ingredient is typically hydrogen peroxide, although some formulas contain sodium percarbonate or sodium perborate. —Jolie Kerr, Better Homes & Gardens, 28 Sep. 2024

Each strip is formulated with enamel-safe hydrogen peroxide that powerfully whitens teeth in a pinch. —Clara McMahon, People.com, 6 Oct. 2024

Each dissolving strip is powered by hydrogen peroxide and the brand's proprietary Elixir X, a blend of antioxidant-rich ingredients like green tea leaf and cranberry seed extracts. —Anamaria Glavan, Allure, 5 Oct. 2024

Word History

First Known Use

1872, in the meaning defined above

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