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

If possible, sanitize your cutting tools with rubbing alcohol or hydrogen peroxide spray between plants when deadheading. — Alexandra Jones, The Spruce, 21 July 2026

The catalyst causes hydrogen peroxide to decompose rapidly into water and oxygen gas. — New Atlas, 18 July 2026

Baking soda, hydrogen peroxide, or oxygen bleach effectively remove stains and grime. — Quincy Bulin, Southern Living, 17 July 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