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
Vaccination rates for flu have been declining since the pandemic, including among children.
—
Alice Park, Time, 15 Aug. 2025
Like flu vaccines, Covid-19 vaccines have typically been updated with formulations that best target the virus strains that are in circulation each season.
—Deidre McPhillips, CNN Money, 12 Aug. 2025
Like flu vaccines, COVID-19 vaccines are updated regularly.
—Lisa Schencker, Chicago Tribune, 10 Aug. 2025
For the flu, begin treatment within 48 hours of symptoms; for COVID-19, within five days, Weber said.
—Evan Moore
august 8, Charlotte Observer, 8 Aug. 2025
See All Example Sentences for flu
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Alice Park, Time, 15 Aug. 2025
Like flu vaccines, Covid-19 vaccines have typically been updated with formulations that best target the virus strains that are in circulation each season.
—Deidre McPhillips, CNN Money, 12 Aug. 2025
Like flu vaccines, COVID-19 vaccines are updated regularly.
—Lisa Schencker, Chicago Tribune, 10 Aug. 2025
For the flu, begin treatment within 48 hours of symptoms; for COVID-19, within five days, Weber said.
—Evan Moore
august 8, Charlotte Observer, 8 Aug. 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 23 Aug. 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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