| Trapezoid 1. (n.) A plane four-sided figure, having two sides parallel to each other. 2. (n.) A bone of the carpus at the base of the second metacarpal, or index finger. 3. (a.) Having the form of a trapezoid; trapezoidal; as, the trapezoid ligament which connects the coracoid process and the clavicle. 4. (a.) of or pertaining to the trapezoid ligament; as, the trapezoid line. Thesaurus Entries cube-shaped, cubed, cubic, cubiform, cuboid, diced, foursquare, oblong, orthogonal, quadrangular, quadrate, quadriform, quadrilateral, rectangular, rhombic, rhomboid, square, tetragonal, tetrahedral, trapezohedral |