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

Sheehan said officers found several bottles of hydrogen peroxide and a knife. —Matt Schooley, CBS News, 8 Dec. 2025

Some homeowners also turn to DIY versions that rely on citric acid, hydrogen peroxide, or vinegar. —Karen Brewer Grossman, Southern Living, 6 Dec. 2025

Many types of toothpaste include additional cleaning agents like baking soda or hydrogen peroxide, enhancing their ability to tackle everyday cleaning challenges. —Jolie Kerr, Better Homes & Gardens, 5 Dec. 2025

Gould said police found a hydrogen peroxide bottle, tarps, shears, snips, a hatchet, and a hacksaw — the last of which was also visibly stained brownish red in a photo shown by the prosecution. —Colleen Cronin, Boston Herald, 4 Dec. 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