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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.
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.