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proostracum

/pru:st'rækəm/

📖 中文释义

  1. [医]前甲（箭石）
📘 English Definition（英文释义）
  1. n. The anterior prolongation of the guard of the
  2. phragmocone of belemnites and allied fossil cephalopods, whether horny
  3. or calcareous. See Illust. of Phragmocone.