\ ˈflü How to pronounce flu (audio) \

Definition of flu

1 : influenza
2 : any of several virus diseases marked especially by respiratory or intestinal symptoms

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Other Words from flu

flu-like \ ˈflü-​ˌlīk How to pronounce flu-like (audio) \ adjective

Examples of flu in a Sentence

He came down with a bad bout of the flu.

Recent Examples on the Web

Flu Shot Clinic & Community Toy Drive Houston Methodist Sugar Land Hospital is once again offering Fort Bend and surrounding area residents the opportunity to donate a gift and receive a free flu shot. Houston Chronicle, "SL Fort Bend Calendar 091819," 16 Sep. 2019 Mercy Health recently instituted a tracking system to watch data such as flu cases. Stephen Means, cleveland.com, "ESPN ranks the 150 best teams in college football history: Buckeye Breakfast," 11 Sep. 2019 To definitively rule out an infection, doctors tested patients’ blood for bacteria, the flu and the virus that causes Legionnaires’ disease. oregonlive, "Oil in lungs while vaping marijuana confirmed as cause for some e-cigarette illnesses," 6 Sep. 2019 Common conditions treated through eCare include: Cold and flu symptoms; skin conditions; seasonal allergies; urinary tract infections; lower back pain, minor burns, cuts, bumps and scrapes; and pink eye. Naseem S. Miller, orlandosentinel.com, "Hurricane Dorian: List of free telemedicine services for Floridians," 4 Sep. 2019 Also, linebacker Khaylan Kearse-Thomas is expected to play despite an injury as is cornerback Chase Lucas, who also has had the flu this week. Jeff Metcalfe, azcentral, "Rewind: Arizona State wins season opener over Kent State," 29 Aug. 2019 Chickenpox, the flu and other diseases can spread quickly. oregonlive.com, "The ICE chief called family detention ‘summer camp. Here’s what it looks like inside," 25 Aug. 2019 Fevers, chills, and joint pain can be easily misdiagnosed as flu or malaria. Katharine Walter, The New Republic, "Ebola Outbreaks Are About Inequality," 8 Aug. 2019 Sharon also shared an update on Ozzy's health, as the veteran rocker has had to delay his farewell tour due to the flu (which led to pneumonia) as well as a fall that resulted in spinal surgery and two other major operations. Taylor Weatherby, Billboard, "Sharon Osbourne Reveals Ozzy's Collaboration With Post Malone Took '30 Minutes'," 12 Sep. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'flu.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of flu

1839, in the meaning defined at sense 1

History and Etymology for flu

by shortening

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Statistics for flu

Last Updated

13 Oct 2019

Look-up Popularity

Time Traveler for flu

The first known use of flu was in 1839

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More Definitions for flu



English Language Learners Definition of flu

: a common disease that is caused by a virus and that causes fever, weakness, body aches, and breathing problems


\ ˈflü How to pronounce flu (audio) \

Kids Definition of flu

1 : influenza
2 : any of several virus diseases something like a cold


\ ˈflü How to pronounce flu (audio) \

Medical Definition of flu

1 : influenza
2 : any of several chiefly viral illnesses marked especially by respiratory or gastrointestinal symptoms — see intestinal flu

Other Words from flu

flu-like \ -​ˌlīk How to pronounce flu-like (audio) \ also flulike adjective
flu-like symptoms

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More from Merriam-Webster on flu

Rhyming Dictionary: Words that rhyme with flu

Spanish Central: Translation of flu

Nglish: Translation of flu for Spanish Speakers

Britannica English: Translation of flu for Arabic Speakers

Britannica.com: Encyclopedia article about flu

Comments on flu

What made you want to look up flu? Please tell us where you read or heard it (including the quote, if possible).


a topic to which one constantly reverts

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