The story
- Englishsesqui-
- Proto-Indo-European*h₂eḱ-der.?
- Ancient Greekὀξύς (oxús)
- Proto-Indo-European*ǵenh₁-
- Proto-Indo-European*ǵénh₁os
- Proto-Hellenic*génos
- Ancient Greekγένος (génos)
- Frenchoxygène
- Proto-Indo-European*h₂eḱ-
- Proto-Indo-European*h₂eḱéh₁yeti
- Proto-Italic*akēō
- Latinaceō
- Proto-Indo-European*dʰeh₁-
- Latinacidu
- Frenchacide
- Frenchoxide
- Englishoxide
- English todaysesquioxide
From sesqui- (“one and a half, a ratio of three to two”) + oxide.
Etymology from Wiktionary, CC BY-SA 4.0.