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

Considerations Before Getting Started Vinegar is a natural cleaner that makes easy work of cutting through tough greasy messes, but it shouldn’t be combined with other cleaners like bleach, hydrogen peroxide, rubbing alcohol, or ammonia. —Karen Brewer Grossman, Southern Living, 14 May 2026

Oxygen gas and other toxic fumes can form when hydrogen peroxide, ammonia, chlorine bleach, or chemical cleaners are mixed in a closed container. —Alexandra Kelly, Martha Stewart, 11 May 2026

Whitening strips blend both the natural process of oil pulling with hydrogen peroxide to safely and effectively release oxygen and hydroxyl free radicals for a brighter, whiter smile in as soon as 14 days. —ABC News, 1 May 2026

The molecule is activated with hydrogen peroxide, and the micromotors move the particle at 7 micrometers per second. —Ameya Paleja, Interesting Engineering, 27 Apr. 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