\Par`al*lel`o*pi"ped\, n. [Gr. ? a body with
parallel surfaces; ? parallel + ? a plane surface, ? on the
ground, or level with it, level, flat; ? on + ? 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.