• synonyms


See more synonyms for flu on Thesaurus.com
  1. influenza.
  2. a specific variety of influenza, usually named for its point of dissemination or its animal vector: Hong Kong flu; swine flu.
Show More

Origin of flu

First recorded in 1830–40; shortened form
Can be confusedflew flu flue
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for flus

heartburn, nausea, disease, epidemic, virus, bug, pollution, flu, malady, ailment, imperfection, deficiency, affliction, frailty, illness, syndrome, cancer, sickness, disability, infection

Examples from the Web for flus

Historical Examples of flus

  • Flustra, flus′tra, n. one of the commonest genera of marine Polyzoa.

    Chambers's Twentieth Century Dictionary (part 2 of 4: E-M)


  • Off the beaten track and anywhere in the Riff country his life would not be worth a flus (small copper coin).

British Dictionary definitions for flus


noun informal
  1. the flu short for influenza
  2. any of various viral infections, esp a respiratory or intestinal infection
Show More
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for flus



1839, flue, shortening of influenza. Spelling flu attested from 1893. For choice of middle syllable, not a common method of shortening in English, Weekley compares tec for detective, scrip for subscription.

Show More
Online Etymology Dictionary, © 2010 Douglas Harper

flus in Medicine


  1. Influenza.
Show More
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

flus in Science


  1. See influenza.
Show More
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.