/ Thesaurus / D Synonyms of diagonal matrix Find synonyms for: Noun1. diagonal matrix, square matrixusage: a square matrix with all elements not on the main diagonal equal to zeroWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language