Noun
Same as Rhomb, 1.
Source: Webster's dictionary..how the movement of the passers-by [in his Street scene painting of 191-14] is comprehended in the rhombus of the heads which is twice repeated. In this way life and movement arise from an original geometric form. [Kirchner designed a diagram together with this line in the letter]. Ernst Ludwig Kirchner
A quadrilateral is a square if and only if it is both a rhombus and a rectangle (four equal sides and four equal angles). Source: Internet
A parallelogram which is not a rhombus. Source: Internet
They were flat diamond, lozenge (or rhombus )-shaped sheets or "blanks" which had been precut to shape before being fed to the machine for creasing and made ready for folding to form a rectangular enclosure. 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
In the case of an orthodiagonal quadrilateral (e.g. rhombus, square, and kite), this formula reduces to since θ is 90°. Source: Internet