n. A polygon with four sides and four angles; a quadrilateral. [Late Latin tetragōnum, from Greek tetragōnon, square, from neuter of Greek tetragōnos, having four angles : tetra-, tetra- + -gōnos, angled; see -GON.] te·trago·nal (tĕ-trăgə-nəl) adj. te·trago·nal·ly adv. |
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