Entry 1 sense Webster, 1913 Bombylious /(bŏm*bĭl"ĭ*ŭs)/ · Bom·byl·i·ous · IPA /bɒmˈbɪliəs/ 01 a. Buzzing, like a bumblebee; as, the bombylious noise of the horse fly. 1. Buzzing, like a bumblebee; as, the bombylious noise of the horse fly.[Obs.]