/ Thesaurus / C Synonyms of corythosaurus Find synonyms for: Noun1. corythosaur, corythosaurus, hadrosaur, hadrosaurus, duck-billed dinosaurusage: duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmetWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: quandary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language