Definition of "blackfly" [blackfly]

• A black or dark green aphid that is a common pest of agricultural crops. (noun)
• Any of various small black bloodsucking flies of the family Simuliidae. (noun)

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• "Noseeums are a particularly nasty, and tiny, species of 'blackfly' which inhabit northern woodlands."
• "Like a looming cloud, I sense the impending return of the mosquito, the blackfly, and the bane of my rural existence, the moosefly."
• "Agricultural activities occur but the area has been less modified by this due mainly to the presence of the blackfly Simulium sp. which causes river blindness and has tended to discourage settlement and encroachment."