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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.
1. A rhombus is a parallelogram with four congruent sides. While the definition states parallelogram, it is sufficient to say:  A quadrilateral is a rhombus if and only if it has four congruent sides., since any quadrilateral with four congruent sides is a parallelogram.