- any of the minute, black gnats of the dipterous family Simuliidae, having aquatic larvae.
Origin of black fly
First recorded in 1600–10
Also called buffalo gnat.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for black fly
Dinky-Dunk, I notice, is as restive as a bull-moose in black-fly season.The Prairie Child
This would explain the rle of the eosinophiles in the black-fly lesion.
Aphides or black-fly may be destroyed by tobacco dust and syringing well with an infusion of soft soap.Gardening for the Million
There was some kind of an animal inside my shirt, and one that made a mosquito, black-fly, or flea seem tame.Tales of lonely trails
The actual nature of the toxic agent in the black-fly is left a matter of speculation.
- any small blackish stout-bodied dipterous fly of the family Simuliidae, which sucks the blood of man, mammals, and birdsSee also buffalo gnat
- Any of various small dark humpbacked flies of whom the females are aggressive biters and serve as vectors in the transmission of onchocerciasis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.