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
This remains important not just against SARS-CoV-2 but also against the multitude of other pathogens out there, including the flu.
—
Bruce Y. Lee, Forbes, 28 Dec. 2024
Here is what to know about where the flu is currently spreading and how to protect yourself.
—Nicole Fallert, USA TODAY, 27 Dec. 2024
Bird flu, or H5N1, has been spreading for years in wild birds, chickens, turkeys and many other animals.
—David Faris, Newsweek, 27 Dec. 2024
Last year, only about half of Americans received their annual flu shot.
—Katie Wiseman, The Indianapolis Star, 27 Dec. 2024
See all Example Sentences for flu 
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Bruce Y. Lee, Forbes, 28 Dec. 2024
Here is what to know about where the flu is currently spreading and how to protect yourself.
—Nicole Fallert, USA TODAY, 27 Dec. 2024
Bird flu, or H5N1, has been spreading for years in wild birds, chickens, turkeys and many other animals.
—David Faris, Newsweek, 27 Dec. 2024
Last year, only about half of Americans received their annual flu shot.
—Katie Wiseman, The Indianapolis Star, 27 Dec. 2024
See all Example Sentences for flu
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Cite this Entry
“Flu.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flu. Accessed 2 Jan. 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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