Platonic solid

noun Geometry.

one of the five regular polyhedrons: tetrahedron, octahedron, hexahedron, icosahedron, or dodecahedron.

Origin of Platonic solid

First recorded in 1950–55

British Dictionary definitions for platonic solid

Platonic solid

noun

any of the five possible regular polyhedra: cube, tetrahedron, octahedron, icosahedron, and dodecahedron Also called (esp formerly): Platonic body

Word Origin for Platonic solid

C17: named after Plato 1, who was the first to list them