influenza

noun
in·flu·en·za | \ˌin-(ˌ)flü-ˈen-zə \

Definition of influenza 

1a : an acute, highly contagious, respiratory disease caused by any of three orthomyxoviruses:

(1) or influenza A : moderate to severe influenza that in humans is marked especially by sudden onset, fever, sore throat, fatigue, muscle aches, inflammation of the respiratory mucous membranes, and cough, that has numerous variants caused by subtypes (such as H1N1, H2N2, or H3N2) of an orthomyxovirus (species Influenza A virus of the genus Influenzavirus A) infecting humans and various animals (such as birds or pigs), and that may occur in seasonal epidemics or sometimes pandemics following mutation in the causative virus

(2) or influenza B : influenza with less severe symptoms that is caused by an orthomyxovirus (species Influenza B virus of the genus Influenzavirus B) infecting only humans and especially children and that may occur in seasonal epidemics but not pandemics

(3) or influenza C : mild influenza that is often asymptomatic, is caused by an orthomyxovirus (species Influenza C virus of the genus Influenzavirus C) infecting only humans, and does not occur in epidemics or pandemics

b : any of various human respiratory infections of undetermined cause not used technically

2 : any of various virus diseases of domestic animals marked especially by fever, respiratory symptoms, and inflammation of mucous membranes

Note: All types of influenza are commonly called "the flu."

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Other Words from influenza

influenzal \ˌin-(ˌ)flü-ˈen-zəl \ adjective
influenzal pneumonia influenzal symptoms

Examples of influenza in a Sentence

Recent Examples on the Web

As of the end of March, the CDC listed New Jersey and Pennsylvania as having low levels of influenza-like illness and Delaware as having minimal levels. Stacey Burling, Philly.com, "As Delaware reports 3 more flu deaths, officials warn the season isn't over yet," 9 Apr. 2018 Doctors like having a variety of drugs on hand for any disease, but especially influenza, which mutates quickly and which can develop resistance to drugs. NBC News, "New, fast-acting flu drug gets priority FDA review," 26 June 2018 In 2017, for example, the Ozaukee County Coroner's Office investigated two deaths from influenza, 20 deaths from motor vehicle accidents, 19 drug overdoses and seven suicides. Jeff Rumage, Milwaukee Journal Sentinel, "Photos: A look inside the Ozaukee County coroner's office," 2 May 2018 With just a few clicks, users can specify key variables such as the region of interest, from as small as a single city to the entire United States, and the type of disease, such as influenza, measles, Ebola, or something new. M. Mitchell Waldrop, Science | AAAS, "What if a nuke goes off in Washington, D.C.? Simulations of artificial societies help planners cope with the unthinkable," 12 Apr. 2018 Sidari contracted type A influenza, which for the past few flu seasons has been the most common lineage in Texas, according to the CDC. Annie Millerbernd, San Antonio Express-News, "How does this flu season compare to past seasons?," 13 Feb. 2018 Just two days after showing signs of influenza, a mother of two from Oregon died of complications from the infection that has killed many across the country this flu season. Jason Duaine Hahn, PEOPLE.com, "Oregon Mom Dies Just Two Days After Being Diagnosed with the Flu: 'I'm at a Loss,' Says Boyfriend," 30 Jan. 2018 The flu, also known as influenza, is a virus easily passed person to person without proper precautions. Staff Report, The Aegis, "Harford hospitals limit patient visitation to prevent spread of the flu," 29 Jan. 2018 According to a chart designating the number of potential non-pediatric fatal cases of influenza, one case is listed in the ADPH's Mobile district. Jared Boyd, AL.com, "Health department reports possible influenza-related death in Mobile area," 26 Jan. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'influenza.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of influenza

1743, in the meaning defined at sense 1a

History and Etymology for influenza

Italian, literally, influence, from Medieval Latin influentia; from the belief that epidemics were due to the influence of the stars

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Dictionary Entries near influenza

influencive

influent

influential

influenza

influx

influxion

info

Statistics for influenza

Last Updated

6 Oct 2018

Look-up Popularity

Time Traveler for influenza

The first known use of influenza was in 1743

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More Definitions for influenza

influenza

noun

English Language Learners Definition of influenza

medical : a common illness that is caused by a virus and that causes fever, weakness, severe aches and pains, and breathing problems

influenza

noun
in·flu·en·za | \ˌin-flü-ˈen-zə \

Kids Definition of influenza

: a very contagious virus disease like a severe cold with fever

influenza

noun
in·flu·en·za | \ˌin-(ˌ)flü-ˈen-zə \

Medical Definition of influenza 

1a : an acute, highly contagious, respiratory disease caused by any of three orthomyxoviruses:

(1) or influenza A : moderate to severe influenza that in humans is marked especially by sudden onset, fever, sore throat, fatigue, muscle aches, inflammation of the respiratory mucous membranes, and cough, is caused by any of several subtypes (such as H1N1, H2N2, or H3N2) of an orthomyxovirus (species Influenza A virus of the genus Influenzavirus A) infecting humans and various animals (such as birds or pigs), and may occur in seasonal epidemics or sometimes pandemics following mutation of the causative virus — see asian flu, avian influenza, bird flu, hong kong flu, spanish flu, swine flu, swine influenza

(2) or influenza B : influenza with less severe symptoms that is caused by an orthomyxovirus (species Influenza B virus of the genus Influenzavirus B) infecting only humans and especially children and that may occur in seasonal epidemics but not pandemics

(3) or influenza C : mild influenza that is often asymptomatic, is caused by an orthomyxovirus (species Influenza C virus of the genus Influenzavirus C) infecting only humans, and does not occur in epidemics or pandemics

b : any human respiratory infection of undetermined cause not used technically

2 : any of various viral diseases of domestic animals (as shipping fever of horses) marked especially by fever, respiratory symptoms, and inflammation of mucous membranes

Note: All types of influenza are commonly called “the flu.”

Other Words from influenza

influenzal \-zəl \ adjective
influenzal pneumonia influenzal symptoms

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More from Merriam-Webster on influenza

Spanish Central: Translation of influenza

Nglish: Translation of influenza for Spanish Speakers

Britannica English: Translation of influenza for Arabic Speakers

Britannica.com: Encyclopedia article about influenza

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