/ Thesaurus / O Synonyms of ornithischian dinosaur Find synonyms for: Noun1. ornithischian, ornithischian dinosaur, dinosaurusage: herbivorous dinosaur with a pelvis like that of a birdWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: devout Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language