# 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 ?
Similarly to the rectangles of the strong interacting sub-star in the dodecahedron, the rectangles of the icosahedron can possess strictly fine center only for a force with a potential squarely increasing with distance.
Notice that the vectors [X.sub.1], ..., [X.sub.12] point to the twelve vertices of the regular icosahedron that is dual to [DELTA] (see Figures 5 and 6).
"You want to design proteins so that when they come together, the interactions cause the proteins to form an icosahedron," explained Baker.
Thus, the cube has 8 vertices, an octahedron has 6, icosahedron has 12, a dodecahedron has 20, for a total of 46, which accounts for the first 92 elements or half of the Periodic Chart.
Caption: Figure 2: Example of initial deformation model: (a) icosahedron, (b) subdividing of icosahedron, and (c) sphere.
Floating inside a cylindrical tube filled with alcohol and blue dye, the icosahedron floats to the window with one of 20 answers.
In 1962, Aaron Klug and Donald Caspar discovered that certain viruses have an icosahedron shape.
They consists of five different shapes: tetrahedron, cube, octahedron, dodecahedron and icosahedron.
In 1987, Fuller reported the first cryoEM structure of Sindbis virus to be a T = 4 icosahedron surrounding a T = 3 core [103]; however, the core was later shown to be T = 4 [104].
A regular icosahedron in the interior of wavefront ball is shown in Figure 2, and twelve vertex coordinates of the regular icosahedron can be calculated [17, 18].
In previous studies, the Cu-centered Voronoi polyhedron with index [0, 0, 12, 0] (full icosahedron (FI)) has been found to be a key structural motif in amorphous Cu-Zr alloys [31].

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