Found 1 items, similar to Orthoceras.
English → English (gcide) Definition: Orthoceras Orthoceras \Or*thoc"e*ras\, n. [NL., fr. Gr. 'orqo`s straight + ke`ras 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. [1913 Webster]