Definition:Parallelepiped

Definition
A parallelepiped is a polyhedron formed by three pairs of parallel planes:


 * Parallelepiped.png

In the above example, the pairs of parallel planes are:


 * $ABCD$ and $HGFE$
 * $ADEH$ and $BCFG$
 * $ABGH$ and $DCFE$

Rectangular Parallelepiped
A rectangular parallelepiped is better known as a cuboid:

Also known as
Some sources give this as parallelopiped.