icosahedron

/ˌaɪkoʊsəˈhiːdɹən/

icosahedron

English Noun

Definition

A polyhedron with twenty faces.

Etymology

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