‖Or‐thoc″e‐ras (?), n. [NL., fr. Gr. ορθὄσ 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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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.