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