nounpl. -·he′dra or -·drons
Origin of icosahedronClassical Greek eikosaedron: see icosi- and -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 wīk&mlowring;tī- 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”).