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 addition to hydrogen peroxide, these strips contain xylitol, which boosts saliva flow and neutralizes the acids in your mouth that can break down your enamel. — Sara Coughlin, Allure, 8 Sep. 2026

There are a number of ways to disinfect them, including with rubbing alcohol, hydrogen peroxide, or a solution of water and bleach. — David Beaulieu, The Spruce, 6 Sep. 2026

Before using hydrogen peroxide on your bathroom floors, consider what type of material they’re made of. — Karen Brewer Grossman, Southern Living, 4 Sep. 2026

The hydrogen peroxide treatment then attacks the remaining dye-cotton linkages and removes residual color. — Alexandra Harrell, Footwear News, 26 Aug. 2026

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