Hypertext Webster Gateway: "icosahedron"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Icosahedron \I`co*sa*he"dron\, n. [Gr. ?; ? twenty + ? seat,
base, fr. ? to sit.] (Geom.)
A solid bounded by twenty sides or faces.
{Regular icosahedron}, one of the five regular polyhedrons,
bounded by twenty equilateral triangules. Five triangles
meet to form each solid angle of the polyhedron.
From WordNet (r) 1.7 (wn)
icosahedron
n : any polyhedron having twenty plane faces
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