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A: A rhombus is an equilateral parallelogram, which is a two-dimensional, four-sided figure in which opposite sides are parallel and all sides have equal length. A square fits this definition. However, it is usually considered a special case, and some definitions of a rhombus specify that squares are not included.
Wiktionary (0.00 / 0 votes) Rate this definition: rhombus (Noun). Any of several flatfishes once considered part of the genus Rhombus. rhombus (Noun). A parallelogram having all sides of equal length. Origin: From rhombus, from á¿¥ÏÎ¼Î²Î¿Ï, from á¿¥Î­Î¼Î²Ï.