[black.fly] n, pl -flies or -fly (1608): any of various small dark-colored insects; esp: any of a family (Simuliidae and esp. genus Simulium) of bloodsucking dipteran flies whose larvae usu. live in flowing streams
BLACKFLY
Meaning of BLACKFLY in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012