| Tetragonal 1. (a.) Of or pertaining to a tetragon; having four angles or sides; thus, the square, the parallelogram, the rhombus, and the trapezium are tetragonal fingers. 2. (a.) Having four prominent longitudinal angles. 3. (a.) Designating, or belonging to, a certain system of crystallization; dimetric. See Crystallization. Thesaurus Entries cube-shaped, cubic, cubiform, cuboid, diced, foursquare, oblong, orthogonal, quadrangular, quadrate, quadriform, quadrilateral, rectangular, rhombic, rhomboid, square, tetragonal, tetrahedral, trapezohedral, trapezoid |