English Explanatory Dictionary

proostracum

English dictionary entry

Meanings

noun
  1. The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous.

Word forms

proostracum proostraca

Etymology

From Ancient Greek προ- (pro-, “before”) + ὄστρᾰκον (óstrăkon, “shell”).

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