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belemnite n. 箭石 箭石 belemnite n 1: a conical calcareous fossil tapering to a point at one end and with a conical cavity at the other end containing ( when unbroken) a small chambered phragmocone from the shell of any of numerous extinct cephalopods of the family BelemnitidaeBelemnite \ Be* lem" nite\, n. [ Gr. ? dart, fr. ? dart, fr. ? to throw: cf. F. b[' e] lemnite.] ( Paleon.) 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. -- { Bel* em* nit" ic}, a. [ 1913 Webster]
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