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nouna 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 Belemnitidaetype of:
Definition that contains belemnite
- phragmacone the thin conical chambered internal shell (either straight or curved) of a belemnite
- phragmocone the thin conical chambered internal shell (either straight or curved) of a belemnite
- belemnitic of or relating to belemnites
- genus spirula genus of small cephalopods with many-chambered spiral shells resembling those of the extinct belemnites