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

To wash fruit with hydrogen peroxide: Mix one part water with one part 3% hydrogen peroxide. —Cody Godwin, USA Today, 4 July 2025

Baking soda mixed with hydrogen peroxide creates a powerful cleaner that's full of cleaning and brightening properties. —Ashlyn Needham, Southern Living, 28 June 2025

The Importance of Diluting Hydrogen Peroxide Use a solution that includes one part 3% hydrogen peroxide and one part water to create a mixture with a 1.5% concentration of hydrogen peroxide. —Anna Giorgi, Verywell Health, 12 May 2025

The best teeth-whitening products for sensitive teeth use a lower concentration of hydrogen peroxide to deliver at-home results without the zings. —Daley Quinn, Glamour, 11 June 2025

Word History

First Known Use

1872, in the meaning defined above

Rhymes for hydrogen peroxide

• aminoglycoside
• chlordiazepoxide
• dimethylformamide
• oligosaccharide
• paraformaldehyde
• polynucleotide
• ribonucleotide
• abide
• allied
• applied
• aside
• astride

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