bird flu

noun

: avian influenza
specifically : severe often fatal influenza A caused by strains of a subtype (H5N1) of the causative orthomyxovirus that have produced epidemics in domestic birds especially in Asia with sporadic associated human infections

Examples of bird flu in a Sentence

Recent Examples on the Web
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Daskalakis was disturbed by Kennedy’s comments that chickens that survive H5N1 bird flu are genetically superior and that the stronger children who get measles will survive. Judy Stone, Forbes.com, 3 Sep. 2025 In the first quarter of the year egg prices were largely influenced by a breakout of avian influenza, commonly known as bird flu, causing prices to stay high. Olivia Evans, Louisville Courier Journal, 3 Sep. 2025 In the first quarter of the year egg prices were largely influenced by a breakout of avian influenza, commonly known as bird flu, causing prices to stay high. Olivia Evans, The Courier-Journal, 28 Aug. 2025 The sharp decline in egg prices is likely due to a decrease in bird flu cases in commercial and backyard flocks since the start of the year. Claire Malon, Chicago Tribune, 15 Aug. 2025 See All Example Sentences for bird flu

Word History

First Known Use

1972, in the meaning defined above

Time Traveler
The first known use of bird flu was in 1972

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Cite this Entry

“Bird flu.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/bird%20flu. Accessed 9 Sep. 2025.

Medical Definition

bird flu

noun
: avian influenza
specifically : severe often fatal influenza A caused by strains of a subtype (H5N1) of the causative orthomyxovirus that have produced epidemics in domestic birds especially in Asia with sporadic associated human infections

More from Merriam-Webster on bird flu

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