11 letters · 17 points in Scrabble
noun any polyhedron having twenty plane faces
originFrom Ancient Greek εἰκοσάεδρον (eikosáedron), from εἴκοσι (eíkosi, “twenty”) + ἕδρα (hédra, “face of a geometrical solid”). Equivalent to icosa- + -hedron.
Etymology from Wiktionary, CC BY-SA 3.0