Definition:Polyhedron

Definition
A polyhedron is a three-dimensional figure that is contained by polygonal faces.

Linguistic Note
The word polyhedron comes directly from the Classical Greek πολύεδρον:
 * polys (πολύς), meaning many
 * hedron (a form of ἕδρα), meaning base or seat.

The technically correct plural of polyhedron is polyhedra, but the word polyhedrons can often be found.