'Parallelopiped' definitions:

Definition of 'parallelopiped'

noun

A prism whose bases are parallelograms [syn: parallelepiped, parallelopiped, parallelepipedon, parallelopipedon]

From: GCIDE

Parallelopiped \Par`al*lel`o*pi"ped\ (p[a^]r`al*l[e^]l`[-o]*p[imac]"p[e^]d), n. [Gr. para`llhlos parallel + 'epi`pedon a plane surface, 'epi`pedos on the ground, or level with it, level, flat; 'epi` on + pe`don the ground: cf. F. parall['e]lopip[`e]de.] (Geom.) 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.
Syn: parallelepiped, parallelepipedon, parallelopipedon. [1913 Webster]