Parallelopiped /(păr`al*lĕl`ō̇*pī"pĕd)/

Par·al·lel·o·pi·ped

Parallelopiped

n.
  1. A solid, the faces of which are six parallelograms, the opposite pairs being parallel, and equal to each other; a prism whose base is a parallelogram. (Geom.)