myEtymology.com: Greek etymology of dodekaedron

Etymology of the Greek word dodekaedron (δωδεκάεδρον)

the Greek word dodekaedron, δωδεκάεδρον

derived from the Greek word dodeka, δώδεκα (two and ten; a dozen)

derived from the Greek word hedra, ἕδρα

derived from the Proto-Indo-European root *sed-