Longman Dictionary of Contemporary English homepage

Topic: ILLNESS AND DISABILITY

Date: 1800-1900
Origin: influenza

flu

noun
     
flu [uncountable]
MI a common illness that makes you feel very tired and weak, gives you a sore throat, and makes you cough and have to clear your nose a lot [= influenza]:
Steven's still in bed with flu.
I couldn't go because I had flu.
a flu virus/bug
the spread of the flu virus
Doctors now fear a flu epidemic.
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