brontide

[ bron-tahyd ]
/ ˈbrɒn taɪd /

noun

a rumbling noise heard occasionally in some parts of the world, probably caused by seismic activity.

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Origin of brontide

apparently < Greek bront(ḗ) thunder + -ide (perhaps for -id1)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020