thunder egg

noun

Definition of thunder egg

: chalcedony in rounded concretionary nodules

Illustration of thunder egg

Illustration of thunder egg

thunder egg: 1 nodule, 2 cutaway

First Known Use of thunder egg

1941, in the meaning defined above

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The first known use of thunder egg was in 1941

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Cite this Entry

“Thunder egg.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/thunder%20egg. Accessed 5 Jul. 2020.

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