from
The Collaborative International Dictionary of English v.0.48
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]