Definition of peroxide in English:

Share this entry


Pronunciation: /pəˈräkˌsīd/


1A compound containing two oxygen atoms bonded together in its molecule or as the anion O22−.
Example sentences
  • Functions include detoxification of free radicals and peroxides, regulation of cell growth and protein function, and maintenance of immune function.
  • The increased accumulation of lipid peroxides is indicative of enhanced production of toxic oxygen species.
  • Similar to peroxides, decomposition of disulfides results in the formation of sulfur-centered radicals.
1.1Hydrogen peroxide, especially as used as a bleach for the hair: [as modifier]: a peroxide blonde
More example sentences
  • Make poultice soaked with 20% peroxide (hair bleaching strength) and a few drops of ammonia.
  • ‘I think it's important to be original,’ the 27-year-old with peroxide blonde hair said.
  • A woman steps out, quite tall with peroxide blonde hair, looks English.


[with object]
Bleach (hair) with peroxide.
Example sentences
  • I am not convinced by her argument that peroxided hair came into vogue in the early 1920s, nor that the national fascination with blondes was strong in that decade.
  • My agent filled them in that my hair had been peroxided and was very weak.
  • It took half an hour before a certain table of heavily peroxided girls understood what an essence was.


Early 19th century: from per- (sense 2) + oxide.

Words that rhyme with peroxide

dioxide, dockside, hydroxide, monoxide, oxide

For editors and proofreaders

Syllabification: per·ox·ide

Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.