Rec·tan·gle n. Geom. A four-sided figure having only right angles; a right-angled parallelogram.
Note: ☞ As the area of a rectangle is expressed by the product of its two dimensions, the term rectangle is sometimes used for product; as, the rectangle of a and b, that is, ab.
Rec·tan·gle, a. Rectangular. [R.]
n : a parallelogram with four right angles