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Webster 1913 Edition

Orthoceras

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Or-thoc′e-ras

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Noun.
[NL., fr. Gr.
ὀρθόσ
straight +
κέρασ
a horn.]
(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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