- n. geometry Any one of the following five polyhedra: the regular tetrahedron, the cube, the regular octahedron, the regular dodecahedron and the regular icosahedron.
- n. any one of five solids whose faces are congruent regular polygons and whose polyhedral angles are all congruent
- Named after the Greek philosopher Plato, who wrote about these solids in his treatise Timaeus. (Wiktionary)
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