parallelepiped
noun
par·al·lel·e·pi·ped ˌper-ə-ˌle-lə-ˈpī-pəd 
ˌpa-rə-,
also -ˌle-ˈle-pə-ˌped
: a 6-faced polyhedron all of whose faces are parallelograms lying in pairs of parallel planes
Word History
Etymology
Greek parallēlepipedon, from parallēlos + epipedon plane surface, from neuter of epipedos flat, from epi- epi- + pedon ground; akin to Latin ped-, pes foot — more at foot
First Known Use
1570, in the meaning defined above