/ Thesaurus / P Synonyms of polygonal shape Find synonyms for: Noun1. polygon, polygonal shape, plane figure, two-dimensional figureusage: a closed plane figure bounded by straight sidesWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language