Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of thunderstone is as below...

Thunderstone :: Thunderstone (n.) A thunderbolt, -- formerly believed to be a stone..

Thunderstone :: Thunderstone (n.) A belemnite. See Belemnite.

Thunderbolt :: Thunderbolt (n.) A belemnite, or thunderstone..

Belemnite :: Belemnite (n.) A conical calcareous fossil, tapering to a point at the lower extremity, with a conical cavity at the other end, where it is ordinarily broken; but when perfect it contains a small chambered cone, called the phragmocone, prolonged, on one side, into a delicate concave blade; the thunderstone. It is the internal shell of a cephalopod related to the sepia, and belonging to an extinct family. The belemnites are found in rocks of the Jurassic and Cretaceous ages..

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