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
Bird flu, also known as avian flu, is an infectious viral illness caused by various strains of the influenza virus.
—
Alyssa Hui, Verywell Health, 3 May 2024
By Alice Park May 3, 2024 1:47 PM EDT
Bird flu, or avian influenza, can be deadly in birds but normally doesn’t infect people.
—Alice Park, TIME, 3 May 2024
See all Example Sentences for flu 
Alyssa Hui, Verywell Health, 3 May 2024
By Alice Park May 3, 2024 1:47 PM EDT
Bird flu, or avian influenza, can be deadly in birds but normally doesn’t infect people.
—Alice Park, TIME, 3 May 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 7 May. 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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