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 have been implicated as vectors of virus encephalitides and possibly of other human and animal diseases
2: a mosquito of the genus Culex
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