'Thunderstone' definitions:
Definition of 'Thunderstone'
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Thunderstone \Thun"der*stone`\, n.
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1. A thunderbolt, -- formerly believed to be a stone.
[1913 Webster]
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Fear no more the lightning flash,
Nor the all-dreaded thunderstone. --Shak.
[1913 Webster]
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2. (Paleon.) A belemnite. See Belemnite.
[1913 Webster]