Trapezoid

·noun A plane four-sided figure, having two sides parallel to each other.

II. Trapezoid ·adj Of or pertaining to the trapezoid ligament; as, the trapezoid line.

III. Trapezoid ·noun A bone of the carpus at the base of the second metacarpal, or index finger.

IV. Trapezoid ·adj Having the form of a trapezoid; trapezoidal; as, the trapezoid ligament which connects the coracoid process and the clavicle.