'Regular icosahedron' definitions:
Definition of 'regular icosahedron'
From: WordNet
noun
An icosahedron with twenty equilateral triangles as faces
Definition of 'Regular icosahedron'
From: GCIDE
- Icosahedron \I`co*sa*he"dron\, n. [Gr. ?; ? twenty + ? seat, base, fr. ? to sit.] (Geom.) A solid bounded by twenty sides or faces. [1913 Webster]
- Regular icosahedron, one of the five regular polyhedrons, bounded by twenty equilateral triangules. Five triangles meet to form each solid angle of the polyhedron. [1913 Webster]