Noun
A solid contained by six rhomboids; a parallelopiped.
Source: Webster's dictionaryA rhombohedron is a parallelepiped with all rhombic faces; a trigonal trapezohedron is a rhombohedron with congruent rhombic faces. Source: Internet
However, two regular tetrahedra can be combined with an octahedron, giving a rhombohedron that can tile space. Source: Internet
The rectangular cuboid (six rectangular faces), cube (six square faces), and the rhombohedron (six rhombus faces) are all specific cases of parallelepiped. Source: Internet