Breadcrumb Home > Thesaurus > F Synonyms of flu Find synonyms for: Noun 1. influenza, flu, grippe, contagious disease, contagion, respiratory disease, respiratory illness, respiratory disorder usage: an acute febrile highly contagious viral disease WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of flu (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: eponymous Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language