The DICT Development Group

  51 Moby Thesaurus words for "quadrilateral":
     bifacial, bilateral, biquadratic, cube-shaped, cubed, cubic,
     cubiform, cuboid, diced, dihedral, flanked, four, four-legged,
     four-rayed, foursquare, handed, lateral, many-sided, multilateral,
     oblong, one-sided, orthogonal, polyhedral, quadrangular, quadrate,
     quadric, quadriform, quadrinomial, quadrivalent, quadruped,
     quartic, quartile, quaternary, rectangular, rhombic, rhomboid,
     sided, square, tetractinal, tetrad, tetragonal, tetrahedral,
     tetravalent, three-sided, trapezohedral, trapezoid, trihedral,
     trilateral, triquetrous, two-sided, unilateral