'Icosahedral' definitions:

Definition of 'icosahedral'

(from WordNet)
adjective
Of or relating to an icosahedron

Definition of 'Icosahedral'

From: GCIDE
  • Icosahedral \I`co*sa*he"dral\, a. [See Icosahedron.] (Geom.) Having twenty equal sides or faces. [1913 Webster]