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

McGowen recommends mixing it with hydrogen peroxide to form a paste, then leaving it on for 20 to 30 minutes. — Lauren Dana Ellman, Travel + Leisure, 19 Aug. 2026

Oxygen Bleach, Explained Meanwhile, in place of chlorine, oxygen bleach relies on sodium carbonate and hydrogen peroxide for its effectiveness. — Caroline Lubinsky, Martha Stewart, 16 Aug. 2026

For larger sections of tile, mix 1 cup baking soda with 1/2 cup hydrogen peroxide into a paste. — Bestreviews, Mercury News, 14 Aug. 2026

Some products on the market contain up to 12% hydrogen peroxide — those must be diluted to avoid irritation or chemical burns. — Sandee Lamotte, CNN Money, 11 Aug. 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