Crossword clues for icosahedron
icosahedron
The Collaborative International Dictionary
Icosahedron \I`co*sa*he"dron\, n. [Gr. ?; ? twenty + ? seat, base, fr. ? to sit.] (Geom.) A solid bounded by twenty sides or faces.
Regular icosahedron, one of the five regular polyhedrons, bounded by twenty equilateral triangules. Five triangles meet to form each solid angle of the polyhedron.
Douglas Harper's Etymology Dictionary
1560s, from Greek eikosahedron, neuter of eikosahedros, from eikosi "twenty" + -hedra "seat, base, chair, face of a geometric solid," from PIE root *sed- (1) "to sit" (see sedentary). Greek eikosi is from PIE *wikmti- "twenty," from *wi- "in half," hence "two" + (d)kmti-, from root *dekm- "ten" (see ten).
Wiktionary
n. 1 (context geometry English) A polyhedron with twenty faces. 2 (context geometry specifically English) A regular icosahedron: one of the Platonic solids, all of whose faces are regular (equilateral) triangles
WordNet
n. any polyhedron having twenty plane faces
[also: icosahedra (pl)]
Wikipedia
In geometry, an icosahedron ( or ) is a polyhedron with 20 faces. The name comes . The plural can be either "icosahedra" or "icosahedrons".
There are many kinds of icosahedra, with some being more symmetrical than others. The best known is the Platonic, convex regular icosahedron.
Usage examples of "icosahedron".
Parz had been joined in his silent vigil beneath Virtuals of the stationary Jovian icosahedron by an unseen congregation of millions.
All over the Earth, and through the rest of the Occupied system, humans had watched the twinkling icosahedron with a mixture of fascination and dread.
The central core of the parlor was an icosahedron of display devices, a tent of their best remaining video wallpaper.
The neck of a crystal vessel in the shape of an icosahedron fitted exactly at and in the hole in the top of the box.
When the sun shone on the transparent icosahedron and its rays were focused in the box, the air was rarefied.
The intermediate arrangements, with cubic, octahedral, and icosahedra symmetry, had never been used.
At last the mouths of the Solar System's second spacetime wormhole had been threaded with icosahedra of blue-glowing exotic matter.
Then he remembered the grouping of icosahedrons he had seen, and then not seen, from the high plaza.
Then he remembered the groupingof icosahedrons he had seen, and then not seen, from the high plaza.
It consisted of a bag partly covered in icosahedrons, made up of lipids and proteins, and containing RNA.
A soccer ball rolled up to the bench, the spherically wondrous geometry of a truncated icosahedron.
It was a fourth-dimensional expression of a truncated icosahedron.
Technically, this form is called a truncated icosahedron, but the name is neither suggestive nor catchy.