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ENGLISH · A WORD WITH POSSIBILITIES

peroxide.

A divalent radical or anion containing two oxygen atoms linked by a covalent bond; any substance containing this group yields hydrogen peroxide when treated with an acid.

8 characters3 syllables approx.English language

Meaning & usage

noun/pəˈɹɒksaɪd/UK/pəˈɹɑksaɪd/Atlantic-Canada, General-American/pəˈɹɒksaɪd/Canada, dialectal/pəˈɹɔksɑed/Australia

  1. A divalent radical or anion containing two oxygen atoms linked by a covalent bond; any substance containing this group yields hydrogen peroxide when treated with an acid.

    countable · uncountable

  2. Hydrogen peroxide, especially when in an aqueous solution used as a bleach.

    countable · uncountable

  3. Any compound containing the functional group R-O-O-R'.

    countable · uncountable
Where this word comes from

Etymology tree English per- Proto-Indo-European *h₂eḱ-der.? Ancient Greek ὀξύς (oxús) Proto-Indo-European *ǵenh₁- Proto-Indo-European *-os Proto-Indo-European *ǵénh₁os Proto-Hellenic *génos Ancient Greek γένος (génos) French oxygène Proto-Indo-European *h₂eḱ- Proto-Indo-European *-éh₁ti Proto-Indo-European *-yeti Proto-Indo-European *-éh₁yeti Proto-Indo-European *h₂eḱéh₁yeti Proto-Italic *akēō Latin aceō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin acidusbor. French acide blend French oxidebor. English oxide English peroxide From per- + oxide.

verb/pəˈɹɒksaɪd/UK/pəˈɹɑksaɪd/Atlantic-Canada, General-American/pəˈɹɒksaɪd/Canada, dialectal/pəˈɹɔksɑed/Australia

  1. To treat (something) with hydrogen peroxide, especially hair in order to bleach it.

    transitive
Where this word comes from

Etymology tree English per- Proto-Indo-European *h₂eḱ-der.? Ancient Greek ὀξύς (oxús) Proto-Indo-European *ǵenh₁- Proto-Indo-European *-os Proto-Indo-European *ǵénh₁os Proto-Hellenic *génos Ancient Greek γένος (génos) French oxygène Proto-Indo-European *h₂eḱ- Proto-Indo-European *-éh₁ti Proto-Indo-European *-yeti Proto-Indo-European *-éh₁yeti Proto-Indo-European *h₂eḱéh₁yeti Proto-Italic *akēō Latin aceō Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idus Latin acidusbor. French acide blend French oxidebor. English oxide English peroxide From per- + oxide.

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Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.