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Related to icosahedron: dodecahedron, Truncated icosahedron, Platonic solids
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 (ī-kō′sə-hē′drən, ī-kŏs′ə-)
n. pl. i·co·sa·he·drons or i·co·sa·he·dra (-drə)
A polyhedron having 20 faces.

[Greek eikosaedron, from neuter of Greek eikosaedros, twenty-sided : eikosi, twenty; see wīkm̥tī- in Indo-European roots + -edros, -sided; see -hedron.]

i·co′sa·he′dral (-drəl) adj.


n, pl -drons or -dra (-drə)
(Mathematics) a solid figure having 20 faces. The faces of a regular icosahedron are equilateral triangles
[C16: from Greek eikosaedron, from eikosi twenty + -edron -hedron]
ˌicosaˈhedral adj


(aɪˌkoʊ səˈhi drən, aɪˌkɒs ə-)

n., pl. -drons, -dra (-drə).
a solid figure having 20 faces.
[1560–70; < Greek eikosáedron=eikosa-, variant of eikosi-, comb. form of eíkosi twenty + -edron -hedron]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.icosahedron - any polyhedron having twenty plane facesicosahedron - any polyhedron having twenty plane faces
polyhedron - a solid figure bounded by plane polygons or faces
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The most complicated Platonic solid is the icosahedron (the shape of 20-sided dice).
They consists of five different shapes: tetrahedron, cube, octahedron, dodecahedron and icosahedron.
The most straightforward is Black Icosahedron, 2013, an 8 1/2-foot-tall steel-bar construction of the twenty-sided geometric form Laban used to diagram the kinesphere.
From there it's on to the pyramid, diamond, and icosahedron.
He further explains that earth is a cube, fire a tetrahedron, air an octahedron, and water an icosahedron (55d6-6b6).
2] obtained by identifying opposite faces in an icosahedron.
It can be demonstrated that the side of the icosahedron and the side of the dodecahedron are incommensurable with each other and each with the sides of the pyramid, cube, and octahedron.
MIX IN the wildcard Trinniberg, a sprinter who is unlikely to make it as far as the top of the stretch but whose trailblazing style will shape the race behind him, plus the likes of the promising Dullahan, Gemologist and Hansen, and although there is no standout choice this year the race has more angles than an icosahedron.
Each lepton group represents the binary rotational symmetries of familiar 3-D regular polyhedrons, the tetrahedron, the octahedron, and the icosahedron.
The other 14 consider such topics as Picard groups of moduli spaces of torsion-free sheaves on curves, vector bundles and the icosahedron, a quasi-complete homogeneous contact manifold associated to a cubic form, orthogonal bundles over curves in characteristic two, parabolic structures, and iterated destabilizing modifications for vector bundles with connection.
The syntegration networking architecture reproduces the geometry of a shape, such as the 20-faceted icosahedron, a physically stable structure with five struts to every node and a pattern of interconnection that ensures that ideas spread very quickly.