EnglishEdit
Alternative formsEdit
- eicosaedrum (obsolete)
- icosaedrum (obsolete)
EtymologyEdit
From Ancient Greek εἰκοσάεδρον (eikosaedron), from εἴκοσι (eikosi, “twenty”) + ἕδρα (hedra, “face of a geometrical solid”).
NounEdit
icosahedron (plural icosahedra or icosahedrons)
- (geometry) A polyhedron with twenty faces.
- (geometry, specifically) A regular icosahedron: one of the Platonic solids, all of whose faces are regular (equilateral) triangles
TranslationsEdit
a polyhedron