Usually means: Geological rock formation with crystals.
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We found 6 dictionaries that define the word thunder egg:

General (5 matching dictionaries)
  1. thunder egg: Merriam-Webster
  2. thunder egg: Infoplease Dictionary
  3. thunder egg: Dictionary.com
  4. Thunder egg: Wikipedia, the Free Encyclopedia
  5. thunder egg: Wiktionary

Science (1 matching dictionary)
  1. Agate Lexicon (No longer online)

Definitions from Wiktionary (Thunder egg)

noun:  Alternative form of thunderegg [A roughly spherical, nodule-like geological structure, similar to a geode, that is formed within a rhyolitic lava flow.]

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