Definitions for thunderstone
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Wiktionary
thunderstone(Noun)
A thunderbolt.
thunderstone(Noun)
A stone or fossil of a kind once thought to be fallen thunderbolts.
Webster Dictionary
Thunderstone(noun)
a thunderbolt, -- formerly believed to be a stone
Thunderstone(noun)
a belemnite. See Belemnite
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"thunderstone." Definitions.net. STANDS4 LLC, 2013. Web. 23 May 2013. <http://www.definitions.net/definition/thunderstone>.

