51Թ

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thunder egg

noun

Geology.
  1. a globular concretion of opal, agate, or chalcedony weathered out of tuff or basalt.


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51Թ History and Origins

Origin of thunder egg1

First recorded in 1940–45
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Example Sentences

Examples have not been reviewed.

Steve Manford, who works at clothes shop Thunder Egg, said the arcade had had "a renaissance" in recent times.

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“It was like a thunder egg,” he says.

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