Origin of icosahedronClassical Greek eikosaedron: see icosi- and amp; -hedron
nounpl. i·co·sa·he·drons or i·co·sa·he·dra
Origin of icosahedronGreek eikosaedron, from neuter of Greek eikosaedros, twenty-sided : eikosi, twenty; see w&imacron;k&mlowring;t&imacron;- in Indo-European roots + -edros, -sided; see –hedron.
(plural icosahedra or icosahedrons)
From Ancient Greek εἰκοσάεδρον (eikosaedron), from εἴκοσι (eikosi, “twenty”) + ἕδρα (hedra, “face of a geometrical solid”).