Polyhedron, in terms of Geometry , is a body comprised of several rectilinear sides or planes. See Body and Solid. This word is form of the Greek word, πολὺ, several , and ἕδρα, meaning seat or face .

If the faces of the polyhedron are regular polygons, all the same and equal, the polyhedron is a regular body, which can be inscribed into a sphere, meaning, that we can circumscribe a sphere, so the surface touched the solid angles of the body. See Regular bodies, etc. There are only five regular polyhedrons : the tetrahedron, the hexahedron or cube, the octahedron, the dodecahedron, and the icosahedron. See these words .

A polyhedral sundial is a stone with many faces, on which the different types of sun dials are projected. See Dial.

Such was that of a place in London that the English call the privy garden , which was destroyed, and was formerly the most beautiful there was in Europe.