Trapezoid (noun)

A quadrilateral having two parallel sides and two nonparallel sides.

Origin:

Late latin trapezium, from greek trapeza, originally meaning 'table'; the sense development has been from 'table' to 'four-sided plane figure with no parallel sides'.

Examples:

1. The interior of a trapezoid is used for calculating the area of a parallelogram.
2. This wall is made of several trapezoids to create an interesting pattern.
3. The base of the pyramid is a large trapezoid shape.
4. The trapezoid shape of the wing helps it to stay aloft.
5. The seat cushions on the couch are trapezoids to fit around the back.