# icosahedron

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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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## Icosahedron

A regular polygon bounded by 20 equilateral triangles, with 12 vertices and 20 edges.

## icosahedron

[ī¦kä·sə¦hē·drən]
(mathematics)
A 20-sided polyhedron.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

## icosahedron

a solid figure having 20 faces. The faces of a regular icosahedron are equilateral triangles
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
In the three dimensional Euclidean space, there are just five types of regular polyhedrons: a regular tetrahedron, cube, regular octahedron, regular dodecahedron and a regular icosahedron. In mathematics education, students at different school levels learn about the basic features of regular polyhedrons.
Many display the 20 triangular faces of an icosahedron. This large group includes the adenoviruses, which can cause respiratory problems in humans, the herpesvirus, the poliovirus, and HIV, the AIDS virus.
Also included was a meteorite which fell in Thuringia in 1581, and, remarkably, a set of what we would today call crystal models (cubes, octahedrons, icosahedrons, dodecahedrons, pyramids and other geometrical shapes cut from wood), although no concept of crystallography yet existed.
Known as platonic solids, shimmering tetrahedrons, cubes, octahedrons, dodecahedrons and icosahedrons are suspended on over 1,000 steel cables in a precise arrangement, providing visitors with a three-dimensional portrait of Sheikh Zayed which can be viewed day and night from a variety of perspectives.

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