A parallelogrammic shape is a quadrilateral that has two pairs of parallel sides. Some synonyms for the word "parallelogrammic" include rectangular, rhomboid, oblong, and quadrilateral. The term rectangular describes a shape that has four right angles and opposite sides that are parallel and equal in length. Rhomboid refers to a shape that has four sides where opposite sides are parallel, and the opposite angles are equal. Oblong refers to a shape that is longer than it is wide. And finally, quadrilateral is a term for any four-sided shape. Each of these synonyms can be used interchangeably with "parallelogrammic" to describe a shape with two pairs of parallel sides.