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|Noun||1.||Belemnitidae - family of extinct Mesozoic cephalopods|
mollusk family - a family of mollusks
Belemnoidea, order Belemnoidea - order of extinct dibranchiate cephalopods related to the surviving spirulas
belemnite - 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