The story
- Ancient Greek · derived fromτετράεδρον“triangle-based pyramid”
- English todaytetrahedron
From Ancient Greek τετράεδρον (tetráedron, “triangle-based pyramid”), from τετράεδρος (tetráedros), from τετράς (tetrás, “four”) + ἕδρα (hédra, “seat”). By surface analysis, tetra- + -hedron.
Etymology from Wiktionary, CC BY-SA 4.0.