The Collaborative International Dictionary of English v.0.48:
Parallelopipedon \Par`al*lel`o*pip"e*don\, n. [NL.] A parallelopiped. --Hutton. [1913 Webster]WordNet (r) 3.0 (2006):
parallelopipedon n 1: a prism whose bases are parallelograms [syn: parallelepiped, parallelopiped, parallelepipedon, parallelopipedon]