noun
- any of the minute, black gnats of the dipterous family Simuliidae, having aquatic larvae.
noun
- any small blackish stout-bodied dipterous fly of the family Simuliidae, which sucks the blood of man, mammals, and birdsSee also buffalo gnat
n.
- Any of various small dark humpbacked flies of whom the females are aggressive biters and serve as vectors in the transmission of onchocerciasis.