proostracum的翻译，读音

英/pru:st'rækəm/

释义：

单词proostracum书写

[医]前甲（箭石）
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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