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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.
Report Abuse. In geometry, a rhombus (or rhomb; plural rhombi) is a quadrilateral in which all of the sides are of equal length, i.e., it is an equilateral quadrangle. If any angle of an equilateral quadrangle is a right angle, then all its angles are right angles and it is also a square. In colloquial usage the shape is often described as a diamond or lozenge. In any rhombus opposite sides will be parallel. Thus, the rhombus is a special case of the parallelogram.