Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

flu

play
noun \ˈflü\

Simple Definition of flu

  • : a common disease that is caused by a virus and that causes fever, weakness, body aches, and breathing problems

Full Definition of flu

  1. 1 :  influenza

  2. 2 :  any of several virus diseases marked especially by respiratory or intestinal symptoms

flu–like play \ˈflü-ˌlīk\ adjective

Examples of flu

  1. He came down with a bad bout of the flu.



Origin of flu

by shortening


First Known Use: 1839



FLU Defined for Kids

flu

play
noun \ˈflü\

Definition of flu

  1. 1 :  influenza

  2. 2 :  any of several virus diseases something like a cold




Medical Dictionary

flu

play
noun \ˈflü\

Medical Definition of flu

  1. 1:  influenza

  2. 2:  any of several diseases caused by bacteria or viruses and marked especially by respiratory or intestinal symptoms—see intestinal flu

  3. flu·like \-ˌlīk\play adjective




Learn More about flu


Seen and Heard

What made you want to look up flu? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

February 7, 2016

a slight offense

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image1037863653

Which of the following refers to thin, bending ice, or to the act of running over such ice?

kittly-benders duvet pince-nez spindrift
Name That Thing

10 quick questions: hear them, spell them, and see how your skills compare to the crowd.

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ