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regular polyhedron[′reg·yə·lər ‚päl·i′hē·drən]
A polyhedron all of whose faces are regular polygons, and whose polyhedral angles are congruent. Also known as platonic solid.
a polyhedron whose faces are identical regular polygons and whose polyhedral angles at the vertices are identical. There are five convex regular polyhedrons: tetrahedron, cube, octahedron, dodecahedron, and icosahedron.