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

Original price: $59.99 Crest 3D Whitestrips use a high concentration of hydrogen peroxide to break down and remove tough stains. —Nora Colomer May Earn A Commission If You Buy Through Our Referral Links. This Content Was Created By A Team That Works Independently From The Fox Newsroom., FOXNews.com, 2 July 2025

Step 3: In a small bowl, mix ½ cup of baking soda with 2-3 tablespoons of hydrogen peroxide. —Daley Quinn, Southern Living, 30 June 2025

Peroxide activity comes from hydrogen peroxide, a chemical known for its ability to kill microbes. —New Atlas, 29 June 2025

As expected, the sensors attached to the infected plants quickly showed signs of hydrogen peroxide, indicating stress. —Mack Degeurin, Popular Science, 19 Mar. 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