• WordNet 3.6
    • v bombinate make a buzzing sound "bees were buzzing around the hive"
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Webster's Revised Unabridged Dictionary
    • v. i Bombinate To hum; to boom.
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Century Dictionary and Cyclopedia
    • bombinate To buzz; make a buzzing sound; bombilate.
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In literature:

Bombinator Australis, GRAY, PROC.
"Journals Of Expeditions Of Discovery Into Central Australia And Overland" by Edward John Eyre
The fololwing of a conata, like the bombination of a chimaera, apparently puts some strain upon the attention of an audience.
"Punch, or the London Charivari, Vol. 156, Feb. 26, 1919" by Various
"Punch, or the London Charivari, Vol. 152, June 6, 1917" by Various
Bombinator australis, Gray Proceedings of the Zoological Society.
"Journals Of Two Expeditions Of Discovery In North-West And Western Australia, Vol. 2 (of 2)" by George Grey
Rotten bastard, bombin' a lot o' wounded!
"Combed Out" by Fritz August Voigt
They appealed to him as a group of carefully tailored Abstractions bombinating mellifluously in a void.
"Erik Dorn" by Ben Hecht
He becomes almost chimaera bombinating in a vacuum.
"Aspects and Impressions" by Edmund Gosse
Diagrammatic longitudinal sections of Bombinator igneus in its early stages (founded upon Goette's observations).
"The Works of Francis Maitland Balfour, Volume 1" by Francis Maitland Balfour

In news:

What is a bombinating beast, and why would anyone make a statue of it, much less steal it.