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

The National Park Service began pouring gallons of hydrogen peroxide to clear the algae. — Swapna Venugopal Ramaswamy, USA Today, 26 June 2026

For a bleach alternative, hydrogen peroxide handles many household jobs. — Lauren Jarvis-Gibson, Charlotte Observer, 25 June 2026

Spray the hydrogen peroxide directly onto the mold in the shower, making sure the areas are saturated. — Maria Sabella, The Spruce, 25 June 2026

Cream of Tartar & Lemon Juice Paste Like baking soda and hydrogen peroxide, cream of tartar and lemon shockingly has cleaning and brightening properties that are effective for lifting dirt and stains off grout lines. — Ashlyn Needham, Southern Living, 25 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