rhom·bo·he·dron /ˌrɑmboˈhidrən/
  菱面體
  Rhom·bo·he·dron n.  Geom. & Crystallog. A solid contained by six rhomboids; a parallelopiped.
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  rhombohedron
       n : a parallelepiped bounded by six similar faces (either
           rhombuses or parallelograms)