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
Several long-standing vaccines, including flu and meningitis shots, were suddenly shifted into a conditional category.
—
Josh M. Shepherd, The Orlando Sentinel, 13 Feb. 2026
But as with the dismantling of huge swaths of our research capacity, this refusal to even consider this mRNA flu vaccine on what are obviously ideological grounds is going to affect a hell of a lot more people than just the cranks who agree with them.
—New York Daily News Editorial Board, New York Daily News, 13 Feb. 2026
Every morning before walking into the ICU, my colleagues and I checked flu activity levels, RSV hospitalizations, drug-resistant organism patterns.
—Robert B. Shpiner, STAT, 13 Feb. 2026
Being able to sanitize can help prevent the spread of illnesses like colds, flu, RSV and COVID-19.
—Bestreviews, Mercury News, 11 Feb. 2026
See All Example Sentences for flu
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Josh M. Shepherd, The Orlando Sentinel, 13 Feb. 2026
But as with the dismantling of huge swaths of our research capacity, this refusal to even consider this mRNA flu vaccine on what are obviously ideological grounds is going to affect a hell of a lot more people than just the cranks who agree with them.
—New York Daily News Editorial Board, New York Daily News, 13 Feb. 2026
Every morning before walking into the ICU, my colleagues and I checked flu activity levels, RSV hospitalizations, drug-resistant organism patterns.
—Robert B. Shpiner, STAT, 13 Feb. 2026
Being able to sanitize can help prevent the spread of illnesses like colds, flu, RSV and COVID-19.
—Bestreviews, Mercury News, 11 Feb. 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 15 Feb. 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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