cu·​lex | \ ˈkyü-ˌleks How to pronounce culex (audio) \

Definition of culex

: any of a large cosmopolitan genus (Culex) of mosquitoes that includes the common house mosquito (C. pipiens) of Europe and North America and vectors of the viruses causing Saint Louis encephalitis and West Nile virus

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Examples of culex in a Sentence

Recent Examples on the Web Weld County health officials said the virus had been identified in culex mosquitoes. Noelle Phillips, The Denver Post, "West Nile Virus found in Weld County mosquitoes," 2 Aug. 2019 The county has 14 traps in various locations to track activity among culex mosquitoes, which carry West Nile. Naperville Sun, "More West Nile-infected mosquitoes found in Will County — this time in Joliet," 12 June 2019 Aedes infirmatus mosquitos as well as other aedes and culex species have also known to carry the virus, the Florida Department of Health said. Ashley May, USA TODAY, "What is Keystone virus? Brain-swelling sickness carried by mosquitoes can infect humans," 25 June 2018 West Nile Virus is transmitted through the bite of a culex pipiens mosquito that encountered the disease by biting an infected bird, according to the release. Alexandra Kukulka,, "Illinois' first West Nile mosquitoes of the year found in north suburbs," 30 May 2018 The culex mosquito can also carry West Nile virus and Japanese encephalitis. Molly Sullivan, sacbee, "Mosquito with possibly debilitating virus found in Yuba County," 7 Aug. 2017 Deutsch said one of the species populations the department was hoping to reduce is the culex quinquefasciatus, also known as the Southern house mosquito, which can carry a variety of illnesses including strains of encephalitis and West Nile. Harry Sayer,, "Orange attacks mosquitoes with aerial spraying," 31 July 2017 Though no mosquitoes carrying the West Nile virus have been found or human cases reported thus far in Kane County, Schlueter said that current hot and humid conditions are those in which the culex mosquito, which carries that disease, thrive. Mike Danahey, Elgin Courier-News, "Elgin, Kane County officials offer heat safety tips," 12 June 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'culex.' 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 culex

15th century, in the meaning defined above

History and Etymology for culex

New Latin, from Latin, gnat; akin to Old Irish cuil fly

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Time Traveler for culex

Time Traveler

The first known use of culex was in the 15th century

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Cite this Entry

“Culex.” Dictionary, Merriam-Webster, Accessed 1 Dec. 2020.

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More Definitions for culex


cu·​lex | \ ˈkyü-ˌleks How to pronounce culex (audio) \

Medical Definition of culex

1 capitalized : a large cosmopolitan genus of mosquitoes that includes the common house mosquito (C. pipiens) of Europe and North America, a widespread tropical mosquito (C. quinquefasciatus synonym C. fatigans) which transmits some filarial worms parasitic in humans, and other mosquitoes which are vectors of the viruses causing Japanese B encephalitis, Murray Valley encephalitis, Saint Louis encephalitis, and West Nile fever
2 : a mosquito of the genus Culex

Other Words from culex

culicine \ ˈkyü-​lə-​ˌsīn How to pronounce culicine (audio) \ adjective or noun

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