proostracum

名词 n.
中文释义

英文释义

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

词形变化

proostraca plural

词源

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