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

Removing Stains From Caulk With Hydrogen Peroxide For tougher mildew and mold stains, use hydrogen peroxide. —Karen Brewer Grossman, Southern Living, 3 June 2026

Spot clean any visible stains like sweat stains with dish soap, hydrogen peroxide, and baking soda. —Sheila Kim, The Spruce, 31 May 2026

For sticky stains, tough spots, or greasy messes, hydrogen peroxide and baking soda mixed into a paste can be used as a spot treatment. —Nafeesah Allen, Better Homes & Gardens, 31 May 2026

For this, combine 1 quart of 3 percent hydrogen peroxide, 1/4 cup of baking soda, and 1 teaspoon of liquid soap. —Rae Ford, Martha Stewart, 23 May 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