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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 I·co·sa·he·dron n.  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.
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From: WordNet (r) 2.0

 regular icosahedron
      n : an icosahedron with twenty equilateral triangles as faces