• WordNet 3.6
    • n bombilation sound of rapid vibration "the buzz of a bumble bee"
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Webster's Revised Unabridged Dictionary
    • n Bombilation A humming sound; a booming. "To . . . silence the bombilation of guns."
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Century Dictionary and Cyclopedia
    • n bombilation A buzzing or droning sound; report; noise. Also bombulation.
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In literature:

It was awe-inspiring, that sonorous bombilation; deafening.
"The Copper-Clad World" by Harl Vincent