1
2
: any of several virus diseases marked especially by respiratory or intestinal symptoms
Examples of flu in a Sentence
He came down with a bad bout of the flu.
Recent Examples on the Web
Has anything changed about getting the flu vaccine?
—
Mary Walrath-Holdridge, USA Today, 23 Oct. 2025
Weekly updates from the more specific FluView have stopped, as have summary reports from RESP-NET that tracks hospitalizations for Covid-19, flu and RSV from a network of hospitals across the country.
—Deidre McPhillips, CNN Money, 22 Oct. 2025
While flu and other respiratory viruses circulate all year, cases tend to increase during fall and winter months in Wisconsin.
—Anna Kleiber, jsonline.com, 22 Oct. 2025
The pill is a single-dose antiviral treatment for people ages 5 and above, typically taken within 48 hours of the onset of flu symptoms.
—Annika Kim Constantino, CNBC, 16 Oct. 2025
See All Example Sentences for flu
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Mary Walrath-Holdridge, USA Today, 23 Oct. 2025
Weekly updates from the more specific FluView have stopped, as have summary reports from RESP-NET that tracks hospitalizations for Covid-19, flu and RSV from a network of hospitals across the country.
—Deidre McPhillips, CNN Money, 22 Oct. 2025
While flu and other respiratory viruses circulate all year, cases tend to increase during fall and winter months in Wisconsin.
—Anna Kleiber, jsonline.com, 22 Oct. 2025
The pill is a single-dose antiviral treatment for people ages 5 and above, typically taken within 48 hours of the onset of flu symptoms.
—Annika Kim Constantino, CNBC, 16 Oct. 2025
See All Example Sentences for flu
Cite this Entry
“Flu.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flu. Accessed 29 Oct. 2025.
Copy CitationKids Definition
flu
noun2
: any of several virus diseases that are something like a cold
flu-like
adjective
ˈflü-ˌlīk
Medical Definition
flu
noun1
2
: any of several chiefly viral illnesses marked especially by respiratory or gastrointestinal symptoms see intestinal flu
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