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

In several experiments, the wearable accurately identified the presence of hydrogen peroxide in groups of plants exposed to a pathogen. —Mack Degeurin, Popular Science, 19 Mar. 2025

This particular kit from Crest grants a professional-level treatment from the comforts of home, by way of hydrogen peroxide that’s powerful but also enamel-friendly. —Stacia Datskovska, WWD, 18 Mar. 2025

Before all else, try home remedies: swab a mix of water and hydrogen peroxide onto the sore several times per day, or rinse with warm water and salt. —Matt Fuchs, TIME, 26 Feb. 2025

These pet-friendly alternatives could be white vinegar and baking soda, or diluted amounts of hydrogen peroxide. —Nafeesah Allen, Better Homes & Gardens, 9 Jan. 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