菱面體
Rhombohedron \Rhom`bo*he"dron\, n. [NL., fr. Gr. ??? rhomb + ??? seat, base.] (Geom. & Crystallog.) A solid contained by six rhomboids; a parallelopiped.
rhombohedron n : a parallelepiped bounded by six similar faces (either rhombuses or parallelograms)