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
The cost of a dozen — though volatile thanks to avian flu — has doubled to more than $3.
—
Rob Wile, NBC News, 14 Aug. 2024
How to prevent back-to-school illness in Wisconsin: Make sure your child is up-to-date on all routine childhood vaccinations, including the annual flu vaccine in the fall.
—Alex Groth, Journal Sentinel, 13 Aug. 2024
So far it has been tested only in ferrets, the animal typically used by labs to test flu vaccines.
—Eduardo Cuevas, USA TODAY, 12 Aug. 2024
The Paris Games also drop all previous COVID protocols, instead approaching the disease like other respiratory illnesses such as the common cold or the flu: officials now allow athletes and teams to determine for themselves how to prevent or respond to infection.
—Saima S. Iqbal, Scientific American, 7 Aug. 2024
See all Example Sentences for flu 
Rob Wile, NBC News, 14 Aug. 2024
How to prevent back-to-school illness in Wisconsin: Make sure your child is up-to-date on all routine childhood vaccinations, including the annual flu vaccine in the fall.
—Alex Groth, Journal Sentinel, 13 Aug. 2024
So far it has been tested only in ferrets, the animal typically used by labs to test flu vaccines.
—Eduardo Cuevas, USA TODAY, 12 Aug. 2024
The Paris Games also drop all previous COVID protocols, instead approaching the disease like other respiratory illnesses such as the common cold or the flu: officials now allow athletes and teams to determine for themselves how to prevent or respond to infection.
—Saima S. Iqbal, Scientific American, 7 Aug. 2024
See all Example Sentences for flu
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'flu.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
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Cite this Entry
“Flu.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flu. Accessed 16 Sep. 2024.
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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