Breadcrumb Home > Thesaurus > Q Synonyms of quadrilateral Find synonyms for: Noun 1. quadrilateral, quadrangle, tetragon, polygon, polygonal shape usage: a four-sided polygon Adjective 1. quadrilateral, four-sided, multilateral (vs. unilateral), many-sided usage: having four sides WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of quadrilateral (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: anomie Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language