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- platonic solid (US)
- (geometry) Any of five convex polyhedra with congruent regular polygonal faces, which have a high degree of symmetry and have been studied since antiquity.
- 1961, J. S. Griffith, The Theory of Transition-Metal Ions, page 41:
- As the names suggest, the groups and their existence are connected to the five Platonic solids. They are in fact the rotation groups of the Platonic solids.
- 2015, Alexander A. Stepanov, Daniel E. Rose, From Mathematics to Generic Programming, page 44,
- In the 13th and final book, he[Euclid] shows how to construct the five Platonic solids, and proves that they are the only regular polyhedra (bodies whose faces are congruent, regular polygons) that exist.
- (Any of five polyhedra): cube, dodecahedron, icosahedron, octahedron, regular hexahedron (cube), tetrahedron
Any one of five polyhedra