tə̇.ˈtragən ə l, -raig- adjective
Etymology: Late Latin tetragonalis, from tetragonum square, quadrangle (from Greek tetragōnon, from neuter of tetragōnos tetragonal, from tetra- + gōnos -cornered, -angled, from gōnia corner, angle) + Latin -alis -al — more at -gon
1. : having four angles or sides
the parallelogram, square, and rhombus are tetragonal figures
— see scalenohedron illustration
2. : of, relating to, or characteristic of the tetragonal system
• te·trag·o·nal·ly -n ə lē, - ə li adverb
• te·trag·o·nal·ness noun -es