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
Nationally, flu activity more than doubled.
—
Marvin Hurst, CBS News, 3 Jan. 2026
At the same time, flu cases are on the rise nationwide.
—Claire Malon, Chicago Tribune, 3 Jan. 2026
In subsequent updates, Kim said doctors described Micah’s illness as an unusually severe case of the flu.
—Emma Bussey, FOXNews.com, 2 Jan. 2026
The flu is going around the Bears locker room and their entire WR corps is banged up.
—Hank Gola, New York Daily News, 2 Jan. 2026
See All Example Sentences for flu
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Marvin Hurst, CBS News, 3 Jan. 2026
At the same time, flu cases are on the rise nationwide.
—Claire Malon, Chicago Tribune, 3 Jan. 2026
In subsequent updates, Kim said doctors described Micah’s illness as an unusually severe case of the flu.
—Emma Bussey, FOXNews.com, 2 Jan. 2026
The flu is going around the Bears locker room and their entire WR corps is banged up.
—Hank Gola, New York Daily News, 2 Jan. 2026
See All Example Sentences for flu
Cite this Entry
“Flu.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flu. Accessed 5 Jan. 2026.
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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