/ Thesaurus / C Synonyms of cimarron river Find synonyms for: Noun1. Cimarron, Cimarron Riverusage: a river that rises in northeastern New Mexico and flows eastward into Oklahoma where it becomes a tributary of the Arkansas RiverWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: reticent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language