Etymology
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belemnite (n.)

type of fossil common in Jurassic sediments, the remains of an extinct squid-like animal, 1640s, from Greek belemnon "dart" (from ballein "to throw, to throw so as to hit," from PIE root *gwele- "to throw, reach") + -ite (1). So called for their shape.

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Definitions of belemnite

belemnite (n.)
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 Belemnitidae;
From wordnet.princeton.edu