/ Thesaurus / C Synonyms of concave polyhedron Find synonyms for: Noun1. concave polyhedron, polyhedronusage: a polyhedron some of whose plane sections are concave polygonsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: candid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language