medical
: a common illness that is caused by a virus and that causes fever, weakness, severe aches and pains, and breathing problems
patients suffering from influenza [=the flu]
Cite this Entry
“Influenza.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/influenza. Accessed 18 Apr. 2026.
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