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
Continue to take other precautions, such as eating a healthy diet, getting enough sleep, and receiving your annual flu vaccine.
—
Ayesha Gulzar, Verywell Health, 17 Oct. 2025
There are several flu vaccines available this season, with recommendations varying by age and medical history.
—Mary Kekatos, ABC News, 17 Oct. 2025
Viral pneumonia can sometimes stem from viruses that include the flu, common cold, COVID-19 and respiratory syncytial virus (RSV), according to Cleveland Clinic.
—Melissa Rudy, FOXNews.com, 16 Oct. 2025
John Gerrard, former chief health officer of Queensland, Australia, wrote in a press release for a March 2024 study comparing symptoms of Covid patients to those with the flu.
—Eli Cahan, Rolling Stone, 16 Oct. 2025
See All Example Sentences for flu
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Ayesha Gulzar, Verywell Health, 17 Oct. 2025
There are several flu vaccines available this season, with recommendations varying by age and medical history.
—Mary Kekatos, ABC News, 17 Oct. 2025
Viral pneumonia can sometimes stem from viruses that include the flu, common cold, COVID-19 and respiratory syncytial virus (RSV), according to Cleveland Clinic.
—Melissa Rudy, FOXNews.com, 16 Oct. 2025
John Gerrard, former chief health officer of Queensland, Australia, wrote in a press release for a March 2024 study comparing symptoms of Covid patients to those with the flu.
—Eli Cahan, Rolling Stone, 16 Oct. 2025
See All Example Sentences for flu
Cite this Entry
“Flu.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flu. Accessed 18 Oct. 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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