From an unused root (meaning to flit); a fly (especially one of a stinging nature) -- fly.
H2070. zebub
זְבוּב noun masculineEcclesiastes 10:1 fly (as moving to and fro in the air? compare Fl NHWBi. 438 b; Late Hebrew id., Assyrian zumbu, DlS 63 f.; Arabic , Aramaic דִּיבָבָא, , ); — literal only מָוֶת זְבוּבֵי 10:1 i.e. dead flies; so AV RV Hi Now and others; > ᵐ5 De and others death-bringing, deadly flies; זְבוּב metaphor of Egyptian army Isaiah 7:18 ("" דְּבוֺרָה, bee, of Assyrian); on זְבוּב בַּעַל see בַּעַל II. 4, p. 127 above