(definition) by Webster 1913 Wed Dec 22 1999 at 1:38:00

Or*thoc"e*ras (?), n. [NL., fr. Gr. straight + 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.

 

© Webster 1913.

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