icosahedron

IPA: aɪkˈɑsʌhˈidrʌn

(geometry) A polyhedron with twenty faces.
(geometry, specifically) A regular icosahedron: one of the Platonic solids, all of whose faces are regular (equilateral) triangles

Examples of "icosahedron" in Sentences

Join five equilateral triangles together and you have the first part of an icosahedron C.
I've rolled the icosahedron and painted a few miniatures myself so it only raises my charisma to be accepted by that culture.
The icosahedron is another of the five regular, or Platonic, bodies having all their sides, angles, and planes similar and equal.
Only five shapes fit the bill: the tetrahedron, the cube, the octahedron, the icosahedron and the dodecahedron, the quintet known as the Platonic solids since Plato wrote about them in the Timaeus.
Then, about 10 years ago, the mathematician Reidun Twarock developed a more general theory of the geometry of viruses based on the symmetries of the icosahedron, but using shapes in six dimensions, not three.
The company receives more than 1 million applications a year and identifies the top candidates through a rigorous screening process that analyzes SAT scores, grade-point averages and their performance on tests with such questions as: "How many different ways can you color an icosahedron with one of three colors on each face?"