1. blackfly

noun. small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals.


  • gnat
  • black fly
  • genus Simulium
  • Simulium

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2. blackfly

noun. blackish aphid that infests e.g. beans and sugar beets.


  • Aphis
  • Aphis fabae
  • bean aphid
  • genus Aphis

Example sentences of the word blackfly

1. Noun, singular or mass
Look for tiny black insects and spiral formations of eggs on the undersides of the lemon tree’s leaves to identify a blackfly infestation.

2. Verb, base form
Black aphids or blackfly infest the young leaves and flower shoots of succulents.