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The Collaborative International Dictionary of English v.0.48:

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