The Collaborative International Dictionary of English v.0.48:
Bombilate \Bom"bi*late\, v. i. [LL. bombilare, for L. bombitare. See Bomb, n.] To hum; to buzz. [R.] [1913 Webster]WordNet (r) 3.0 (2006):
bombilate v 1: make a buzzing sound; "bees were buzzing around the hive" [syn: buzz, bombinate, bombilate]