orthoceras definition

  • noun:
    • An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is split into many chambers by transverse septa.
    • the conventional genus of Orthoceratid√¶, obtaining the shell straight or but slightly curved. The species are particularly many, which range from the Silurian toward Liassic. Also Orthoceratites, Orthocerus.

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  • Sentence for "orthoceras"
    • Some of the ammonites, which belonged…
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