icosahedron

The story

1. Ancient Greek · derived fromεἰκοσάεδρον
2. English todayicosahedron

From Ancient Greek εἰκοσάεδρον (eikosáedron), from εἴκοσι (eíkosi, “twenty”) + ἕδρα (hédra, “face of a geometrical solid”). Equivalent to icosa- + -hedron.