/ Thesaurus / N Synonyms of nothosaur Find synonyms for: Noun1. nothosaur, archosaur, archosaurian, archosaurian reptileusage: extinct marine reptile with longer more slender limbs than plesiosaurs and less completely modified for swimmingWordNet 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