/ Thesaurus / C Synonyms of concave polygon Find synonyms for: Noun1. concave polygon, polygon, polygonal shapeusage: a polygon such that there is a straight line that cuts it in four or more pointsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language