The story
- Proto-Indo-European*swéḱs
- Proto-Hellenic*hwéks
- Ancient Greekἕξ (héx)
- Ancient Greekἑξα- (hexa-)
- Latinhexa-
- Englishhexa-
- Englishhydro-
- Proto-Indo-European*dʰeh₁-
- Englishhydride
- English todayhexahydride
Etymology from Wiktionary, CC BY-SA 4.0.