Flu definition

flo͝o
Influenza.
noun
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(popularly) Any of various respiratory or intestinal infections caused by a virus.
noun
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Influenza.
noun
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Any of several infections that affect the respiratory or gastrointestinal tract and are caused by viruses other than the influenza virus.
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noun
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(informal) Common cold.
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(UK) Dated form of flu.
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Other Word Forms

Noun

Singular:
flu
Plural:
flus

Origin of flu

  • Short for influenza

    From American Heritage Dictionary of the English Language, 5th Edition

  • Abbreviation of influenza.

    From Wiktionary

  • A shortening of influenza.

    From Wiktionary