Bible Dictionaries
Proostracum
Webster's Dictionary
(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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Bibliography Information
Webster, Noah. Entry for 'Proostracum'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/p/proostracum.html. 1828.