icosahedron


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icosahedron

i·co·sa·he·dron

 (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.

icosahedron

(ˌaɪkəsəˈhiːdrən)
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

i•co•sa•he•dron

(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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However, upon reading the written exams, it became apparent that many students had confused the Euclidean shapes of Platonic solids; namely: cube, tetrahedron, octahedron, dodecahedron, icosahedron with non-Euclidean geometry figures.
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The newly-discovered quasicrystal also exhibits a five-fold rotational symmetry associated with an icosahedron - a geometric structure with 20 faces.
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There are only 5 basic solid shapes in addition to the sphere and torus: cube, tetrahedron, octahedron, dodecahedron, and icosahedron.
For producing the initial surface model, a tessellated sphere is generated by starting with an icosahedron and iteratively subdividing each triangle into several smaller triangles.
structure, the properties of regular polyhedrons as tetrahedron, hexahedron, octahedron, dodecahedron or icosahedron can be used in buildings architecture (Figure 6).
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.
Based on aforementioned design method, other polyhedrons in geometry, such as octahedron, dodecahedron and icosahedron, can be adopted to project homogeneous and non-singular cloaks similarly.