Icosahedron

Alternative forms

• eicosaedrum obsolete
• icosaedrum obsolete

Origin

From Ancient Greek εἰκοσάεδρον, from εἴκοσι ("twenty") + ἕδρα (hedra, "face of a geometrical solid").

Full definition of icosahedron

Noun

1. (geometry) A polyhedron with twenty faces.
2. (geometry, specifically) A regular icosahedron: one of the Platonic solids, all of whose faces are regular (equilateral) triangles

Related terms

• icosahedral
• icosahedrite
• truncated icosahedron