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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 Orthoceras
 直角石屬

From: Webster's Revised Unabridged Dictionary (1913)

 Or·thoc·e·ras n.  Paleon. An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell.  The interior is divided into numerous chambers by transverse septa.
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