1. blackish aphid that infests e.g. beans and sugar beets • Syn: bean aphid, Aphis fabae • Hypernyms: aphid • Member Holonyms: Aphis, genus Aphis 2. small blackish stout-bodied biting fly having aquatic larvae; sucks the blood of birds as well as humans and other mammals • Syn: black fly, buffalo gnat • Hypernyms: gnat • Member Holonyms: Simulium, genus Simulium