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icosahedron
(redirected from icosahedra)

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.01 sec.
i·co·sa·he·dron  (-ks-hdrn, -ks-)
n. pl. i·co·sa·he·drons or i·co·sa·he·dra (-dr)
A polyhedron having 20 faces.

[Greek eikosaedron : eikosi, twenty; see wkt- in Indo-European roots + -edron, -hedron.]

i·cosa·hedral (-drl) adj.
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icosahedron

icosahedron [ike-oh-sa-heed-ron, -dra]
Noun
pl -drons or -dra a solid figure with 20 faces [Greek eikosi twenty + -edron -sided]

icosahedron  (-ks-hdrn)
Plural icosahedrons or icosahedra
A polyhedron having twenty faces.

icosahedral adjective
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icosahedron
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.icosahedronicosahedron - any polyhedron having twenty plane faces
polyhedron - a solid figure bounded by plane polygons or faces

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? Mentioned in ? References in periodicals archive
 
Icosahedra also have locations around which there is threefold or twofold symmetry.
Regular icosahedra and dodecahedra are special forms of both icosahedral point groups, 235 and m35.
By contrast, in dimension three, the most symmetric kissing arrangement--the icosahedron--leaves wiggle room between the spheres and can't be extended to all of space, since icosahedra can't fill space without overlapping.
 
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