Meaning

noun two-winged insect whose female has a long proboscis to pierce the skin and suck the blood of humans and animals

originBorrowed from Spanish mosquito (“gnat”), diminutive of mosca (“fly”), from Latin musca (“fly”), from Proto-Indo-European *mūs- (“fly, stinging fly, gnat”). Cognate with West Flemish meuzie (“mosquito”), dialectal Swedish mausa (“fly”), Lithuanian musė (“a fly”) and Sicilian muschitta (“midge”). See also midge. First attested in the 1580s.

Etymology from Wiktionary, CC BY-SA 3.0