sesquioxide

S1E1S1Q10U1I1O1X8I1D2E1

noun

Any oxide containing three oxygen atoms for every two atoms of another element.

OriginEnglish oxide ← French oxide ← Latin acidu →
Scrabble 28
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Meanings

nounsesquioxide (plural sesquioxides)

plural sesquioxides

  1. chemistryAny oxide containing three oxygen atoms for every two atoms of another element.

Origin

  1. Englishsesqui-
  2. Proto-Indo-European*h₂eḱ-der.?
  3. Ancient Greekὀξύς (oxús)
  4. Proto-Indo-European*ǵenh₁-
  5. Proto-Indo-European*ǵénh₁os
  6. Proto-Hellenic*génos
  7. Ancient Greekγένος (génos)
  8. Frenchoxygène
  9. Proto-Indo-European*h₂eḱ-
  10. Proto-Indo-European*h₂eḱéh₁yeti
  11. Proto-Italic*akēō
  12. Latinaceō
  13. Proto-Indo-European*dʰeh₁-
  14. Latinacidu
  15. Frenchacide
  16. Frenchoxide
  17. Englishoxide
  18. Englishsesquioxide

From sesqui- (“one and a half, a ratio of three to two”) + oxide.

Full word history & related roots →

Translations

French sesquioxyde
  • sesquioxydeTranslations
Portuguese sesquióxido
  • sesquióxidoTranslations
Spanish sesquióxido
  • sesquióxidoTranslations
Cite this entry
APA

sesquioxide. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/sesquioxide

MLA

“sesquioxide.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/sesquioxide. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “sesquioxide,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/sesquioxide.

Source: sesquioxide on Wiktionary, CC BY-SA 4.0.