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
Pharmacists are trusted healthcare professionals trained to screen patients, administer injections and provide vaccines, such as flu and COVID-19 shots.
—
Voice Of The People, New York Daily News, 15 May 2026
While most of the big studies that have made headlines have focused on routine vaccines—shingles and the flu, for example, a study in 2023 found that the BCG vaccine is also associated with a significantly lower risk of dementia.
—Beth Mole, ArsTechnica, 15 May 2026
Infected birds shed flu viruses in their saliva, mucus, and feces.
—Christopher Edwards, PEOPLE, 14 May 2026
There is no reason to link what appears to be a stomach flu outbreak aboard a ship that departed Belfast and Liverpool to the hantavirus cluster aboard the luxury Hondius ship, which traveled between Argentina and the Canary Islands, the regional health authority said in a statement.
—Makini Brice, USA Today, 13 May 2026
See All Example Sentences for flu
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Voice Of The People, New York Daily News, 15 May 2026
While most of the big studies that have made headlines have focused on routine vaccines—shingles and the flu, for example, a study in 2023 found that the BCG vaccine is also associated with a significantly lower risk of dementia.
—Beth Mole, ArsTechnica, 15 May 2026
Infected birds shed flu viruses in their saliva, mucus, and feces.
—Christopher Edwards, PEOPLE, 14 May 2026
There is no reason to link what appears to be a stomach flu outbreak aboard a ship that departed Belfast and Liverpool to the hantavirus cluster aboard the luxury Hondius ship, which traveled between Argentina and the Canary Islands, the regional health authority said in a statement.
—Makini Brice, USA Today, 13 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 16 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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