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Pronunciation varies by accent · noun
(paleontology) The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous..
Use proostracum when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Proostracum means (paleontology) The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use proostracum where its definition matches the intended context.
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