flu

noun

ˈflü 

1

: influenza

2

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

flu-like

ˈflü-ˌlīk 

adjective

Examples of flu in a Sentence

He came down with a bad bout of the flu.

Recent Examples on the Web

The first is about three ways to get rid of the flu fast. —Kenda Laney, Forbes, 21 Feb. 2025

Louisiana's top leaders are sending mixed signals about vaccines just as the nation's flu numbers are hitting historic highs. —Chelsea Brasted, Axios, 21 Feb. 2025

The agency has indefinitely postponed a public meeting of its vaccine advisory committee and killed a campaign promoting seasonal flu shots. —Kevin Purdy, Ars Technica, 21 Feb. 2025

Hammond has written and edited explainers on a number of health and wellness topics, including racial disparities in HIV treatment, the metabolic benefits of cold exposure, how the flu shot works, and solutions for seasonal dermatology woes. —Rob Williams, EverydayHealth.com, 21 Feb. 2025

Word History

Etymology

by shortening

First Known Use

1839, in the meaning defined at sense 1

Phrases Containing flu

• anti-flu
• Asian flu
• bird flu
• blue flu
• flu season
• swine flu
• yuppie flu

Rhymes for flu

• blew
• blue
• boo
• brew
• chew
• chou
• clue
• coo
• coup
• crew
• cue
• dew

Kids Definition

flu

noun

ˈflü 

1

: influenza sense 1

2

: any of several virus diseases that are something like a cold

flu-like

ˈflü-ˌlīk

adjective

Medical Definition

flu

noun

ˈflü 

1

: influenza

2

: any of several chiefly viral illnesses marked especially by respiratory or gastrointestinal symptoms see intestinal flu

flu-like

-ˌlīk 

adjective

also flulike

flu-like symptoms