Proostracum
Pro`os´tra`cum
| n. | 1. | (Zool.) The anterior prolongation of the guard of the phragmocone of belemnites and allied fossil cephalopods, whether horny or calcareous. See Illust. of Phragmocone. |
| 单词 | proostracum | |||
| 释义 | ProostracumPro`os´tra`cum
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