parallelepiped

A solid with six faces, each a parallelogram and each being parallel to the opposite face.

A prism whose bases are parallelograms.

In experimental psychology, an outline drawing of a parallelepiped, with one diagonal drawn in, embodying an illusion of reversible perspective. The figure was published by Necker in 1832: the name ‘cube’ properly belongs to a similar figure published by Wheatstone in 1838. See illusion. 2.

Solid figure, having six faces, all parallelograms; all opposite faces being similar and parallel.