belemnite
noun
bel·em·nite
| \ ˈbe-ləm-ˌnīt
\
\
Definition of belemnite
1
: any of various extinct cephalopods (order Belemnoidea) especially abundant in the Mesozoic era that had internal shells and that superficially resembled and are regarded as ancestors of the squids
2
: the fossilized bullet-shaped remains of a belemnite
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