brontide

bron·tide

[bron-tahyd]
noun
a rumbling noise heard occasionally in some parts of the world, probably caused by seismic activity.

Origin:
apparently < Greek bront() thunder + -ide (perhaps for -id1)

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Brontide is always a great word to know.
So is ninnyhammer. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a fool or simpleton; ninny.
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