The story
- Proto-Indo-European*kʷetwóres
- Proto-Hellenic*kʷétwores
- Ancient Greekτέσσᾰρες (téssăres)
- Ancient Greekτετρᾰ- (tetră-)
- Englishtetra-
- Englishsexagesimal
- English todaytetrasexagesimal
From tetra- + sexagesimal.
Etymology from Wiktionary, CC BY-SA 4.0.