belemnite

belemnite

[bel-uhm-nahyt]
noun Paleontology.
a conical fossil, several inches long, consisting of the internal calcareous rod of an extinct animal allied to the cuttlefish; a thunderstone.

Origin:
1640–50; < French bélemnite, equivalent to Greek bélemn(on) a dart (noun derivative from base of bállein to throw) + French -ite -ite1

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World English Dictionary
belemnite (ˈbɛləmˌnaɪt)
 
n
1.  any extinct marine cephalopod mollusc of the order Belemnoidea, related to the cuttlefish
2.  the long pointed conical internal shell of any of these animals: a common Mesozoic fossil
 
[C17: from Greek belemnon dart]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
belemnite   (běl'əm-nīt')  Pronunciation Key 
  1. Any of various extinct cephalopod mollusks of the order Belemnoidea that lived from the Triassic into the Tertiary Period. Belemnites had a large, cone-shaped internal shell with a complex structure that served as a support for muscles and as a hydrostatic device. Belemnites were closely related to the present-day squids and cuttlefishes.

  2. The fossilized internal shell of one of these cephalopods. Belemnites are used as index fossils.


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