Orthoceras

Orthoceras

Or*thoc"e*ras\, n. [NL., fr. Gr. 'orqo`s 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's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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