icosahedron(redirected from Gyroelongated pentagonal bipyramid)
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icosahedron(īkō'səhē`drən): see polyhedronpolyhedron
, closed solid bounded by plane faces; each face of a polyhedron is a polygon. A cube is a polyhedron bounded by six polygons (in this case squares) meeting at right angles.
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A regular polygon bounded by 20 equilateral triangles, with 12 vertices and 20 edges.
A 20-sided polyhedron.
a solid figure having 20 faces. The faces of a regular icosahedron are equilateral triangles