Geometric solid all of whose faces are identical regular polygons and all of whose angles are equal. There are only five such polyhedrons. The cube is constructed from the square, the dodecahedron from the regular pentagon, and the tetrahedron, octahedron, and icosahedron (with 20 faces) from the equilateral triangle. They are known as the Platonic solids because of Plato's attempt to relate each to one of the five elements that he believed formed the world.
Variants of PLATONIC SOLID
Platonic solid also known as regular polyhedron
This entry comes from Encyclopædia Britannica Concise.
For the full entry on Platonic solid, visit Britannica.com.
Seen & Heard
What made you look up Platonic solid? Please tell us what you were reading, watching or discussing that led you here.