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

Built on a carbon cloth support, the electrode contains a polyarylether backbone that drives the oxygen reduction reaction to produce hydrogen peroxide, along with amidoxime groups that selectively bind uranyl ions. —Prabhat Ranjan Mishra, Interesting Engineering, 27 Nov. 2025

Use a fresh mixture of 1 quart of 3 percent hydrogen peroxide, ¼ cup baking soda, and 1 teaspoon liquid dish soap—never store this mix in a closed container. —Maria Azzurra Volpe, MSNBC Newsweek, 25 Nov. 2025

Rinse the stain with cold water, then spray it with a mixture of equal parts dish soap, hydrogen peroxide and baking soda. —Cody Godwin, USA Today, 19 Nov. 2025

Bleach can also have a dangerous reaction with cleaners that contain ammonia, hydrogen peroxide, or acids like vinegar. —Brandee Gruener, Southern Living, 16 Nov. 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