Orthoceras
Or`thoc´e`ras
| n. | 1. | (Paleon.) An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa. |
| 单词 | orthoceras | |||
| 释义 | OrthocerasOr`thoc´e`ras
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