·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.