A prism whose bases are parallelograms.

In geometry, a parallelepiped (now usually pronounced , traditionallye.g. Oxford English Dictionary, 1904 in accordance with its etymology in Greek παραλληλ-επίπεδον, a body "having parallel planes") is a three-dimensional figure like a cube, except that its faces are not squares but parallelograms.

(1) A four-sided rectilinear shape bounded by two sets of parallel lines. (2) A classification approach which sub-divides the image data space into categories defined by channel themes. These themes may be represented as parallelepipeds on image crossplot diagrams.