Is 'mosquito' English, or is it actually Spanish?

'Mosquito' is a word borrowed from Spanish 'mosca'. The word entered the English language some time around 1583.

mosquito [noun] [circa 1583]

Any of a family (Culicidae) of dipteran flies with females that have a set of slender organs in the proboscis adapted t...

See 'mosquito' on the Loan Words Map

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Etymology: Spanish, diminutive of 'mosca' fly, from Latin 'musca'

See more loan words from 1500s.