bombilation

plural bombilations

1. countableuncountableA humming or booming sound.

   Yet it was possible in still weather to hear the muted bombilation of the sleepless city and when the wind was in the north to count the hammer-strokes of the great bell of St. Paul's.

   1920, Sax Rohmer, “Chapter 1”, in The Green Eyes of Bast

   1 more example

   The bumblebee's mane glowed in the morning light—each hair sharp and distinct to Eragon—and its blurred wings generated a gentle bombilation, like a tattoo played on a drum. Pollen powdered the bristles on its legs.

   2008, Christopher Paolini, “Rider and Ra'zac”, in Brisingr, page 69