thunderegg

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noun

A roughly spherical, nodule-like geological structure, similar to a geode, that is formed within a rhyolitic lava flow.

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Meanings

nounthunderegg (plural thundereggs)

plural thundereggs · alternative thunder egg

  1. A roughly spherical, nodule-like geological structure, similar to a geode, that is formed within a rhyolitic lava flow.

Origin

From thunder + egg.

Full word history & related roots →

Translations

Chinese Mandarin 雷公蛋石
  • 雷公蛋石 (léigōng dànshí)Translations
Finnish ukkosenmuna
  • ukkosenmunaTranslations
Cite this entry
APA

thunderegg. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/thunderegg

MLA

“thunderegg.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/thunderegg. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “thunderegg,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/thunderegg.

Source: thunderegg on Wiktionary, CC BY-SA 4.0.