Webster's English Dictionary

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parallelepiped

par.al.lel.epi.ped \.par-*-.lel-*-'pi--p*d, -'pip-*d; -.lel-'ep-*-.ped\ n 
   [Gk paralle-lepipedon, fr. paralle-los + epipedon plane] surface, fr. neut. 
   of epipedos flat, fr. epi- + pedon ground; akin to L ped-, pes foot - more 
   at FOOT : a prism whose bases are parallelograms