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black fly

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noun
  1. 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 blackfly

Historical Examples

  • The blackfly and mosquito attack both man and beast in maddening millions.

    Animal Sanctuaries in Labrador

    William Wood


British Dictionary definitions for blackfly

blackfly

noun plural -flies
  1. a black aphid, Aphis fabae, that infests beans, sugar beet, and other plantsAlso called: bean aphid

black fly

noun
  1. any small blackish stout-bodied dipterous fly of the family Simuliidae, which sucks the blood of man, mammals, and birdsSee also buffalo gnat
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

blackfly in Medicine

black fly

n.
  1. 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.