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Definition of flu

flu

/fluː/
flu

Plural:flus
•
Adjective:flulike
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flu Lexical Profile

flu Game Scores & Validity

• noun

1

An acute, highly contagious viral infection of the respiratory tract that causes fever, severe aching, fatigue, and catarrh; influenza.

Example

"Several students missed class last week after catching a severe strain of the flu."


2

Any of various acute viral illnesses loosely resembling influenza or causing gastrointestinal distress, such as viral gastroenteritis.

Example

"He stayed home to recover from a mild stomach flu that lasted for two days."

Synonyms
View all synonyms for flu

Word Nuance & Usage

Do not confuse 'flu' (the viral respiratory illness influenza) with its homophones 'flue' (a chimney duct or pipe for smoke) and 'flew' (the past tense of the verb 'fly').

• Rhymes for flu

Word Origin & Etymology

Coined in the early 19th century as a colloquial clipping of 'influenza', which entered English from Italian (literally meaning 'influence'), reflecting the medieval belief that epidemics were caused by the astrological influence of the stars.

Cite this Entry


Wordmom. (2026). Definition of Flu. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/flu
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