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

In an effort combat the algae in the Reflecting Pool, employees of the National Park Service were seen pouring in gallons of hydrogen peroxide, a chemical commonly used in pool maintenance. —Los Angeles Times, 20 June 2026

But the next day, USA TODAY confirmed the green color was still there, and workers were pouring hydrogen peroxide into the water. —Jeanine Santucci, USA Today, 20 June 2026

Workers were seen in recent days removing algae from the Reflecting Pool, and on Tuesday morning, crews dumped bottles of hydrogen peroxide into the water. —CBS News, 20 June 2026

In an effort to combat the algae growth, National Park Service workers dumped bottles of hydrogen peroxide into the water. —Joseph Nepomuceno, The Washington Examiner, 20 June 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