WordReference Random House Learner's Dictionary of American English © 2026
ˈhy•dro•gen perˈox•ide, n. [uncountable]
  1. Chemistrya colorless liquid which is used chiefly as an antiseptic and to bleach or whiten objects.
See -hydr-.
WordReference Random House Unabridged Dictionary of American English © 2026
hy′drogen perox′ide, 
  1. Chemistrya colorless, unstable, oily liquid, H2O2, an aqueous solution of which is used chiefly as an antiseptic and a bleaching agent.
  • 1870–75

Collins Concise English Dictionary © HarperCollins Publishers::
hydrogen peroxide n
  1. a colourless oily unstable liquid, usually used in aqueous solution. It is a strong oxidizing agent used as a bleach for textiles, wood pulp, hair, etc, and as an oxidizer in rocket fuels. Formula: H2O2
'hydrogen peroxide' also found in these entries (note: many are not synonyms or translations):
oxidizing agent - peroxide - barium peroxide - catalase - oxidase - ozonic ether - peroxidase - peroxyacid - peroxy group - persulfuric acid

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