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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.
Armor-plated puzzle: deciphering the code of viral geometry by Weiss, Peter Ulrich / Science News
Regular icosahedra and dodecahedra are special forms of both icosahedral point groups, 235 and m35.
Quasicrystals by Cahn, John W. / Journal of Research of the National Institute of Standards and Technology
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.
Oddballs: it's easier to pack spheres in some dimensions than in ... by Klarreich, Erica / Science News
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