Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of proostracum is as below...

Proostracum :: Proostracum (n.) The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous. See Illust. of Phragmocone..

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