/ Thesaurus / P Synonyms of peyton rous Find synonyms for: Noun1. Rous, Peyton Rous, Francis Peyton Roususage: United States pathologist who discovered viruses that cause tumors (1879-1970)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language