noun a plane four-sided figure, having two sides parallel to each other.
2. trapezoid ·adj of or pertaining to the trapezoid ligament; as, the trapezoid line.
3. trapezoid ·noun a bone of the carpus at the base of the second metacarpal, or index finger.
4. trapezoid ·adj having the form of a trapezoid; trapezoidal; as, the trapezoid ligament which connects the coracoid process and the clavicle.