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
One doctor pointed to the drop showing a return to normal after a seasonal flu spike, with little change compared to the prior year.
—
Jessica Bartlett — Boston Globe, STAT, 21 May 2026
Maybe the flu, food poisoning, or a really bad cold.
—Greg Engle, Forbes.com, 21 May 2026
The virus starts with flu-like symptoms, including fever, chills, fatigue, headache, muscle pain, vomiting/diarrhea and loss of appetite.
—Angelica Stabile, FOXNews.com, 19 May 2026
Potential reasons included avian flu and having ingested something toxic such as rodenticide, the Post-Gazette reported.
—Finch Walker, USA Today, 18 May 2026
See All Example Sentences for flu
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Jessica Bartlett — Boston Globe, STAT, 21 May 2026
Maybe the flu, food poisoning, or a really bad cold.
—Greg Engle, Forbes.com, 21 May 2026
The virus starts with flu-like symptoms, including fever, chills, fatigue, headache, muscle pain, vomiting/diarrhea and loss of appetite.
—Angelica Stabile, FOXNews.com, 19 May 2026
Potential reasons included avian flu and having ingested something toxic such as rodenticide, the Post-Gazette reported.
—Finch Walker, USA Today, 18 May 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 27 May. 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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