Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of orthoceras is as below...

Orthoceras :: Orthoceras (n.) An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa..

Tetrabranchiata :: Tetrabranchiata (n. pl.) An order of Cephalopoda having four gills. Among living species it includes only the pearly nautilus. Numerous genera and species are found in the fossil state, such as Ammonites, Baculites, Orthoceras, etc..

Orthoceratite :: Orthoceratite (n.) An orthoceras; also, any fossil shell allied to Orthoceras..

Straight-joint :: Straighthorn (n.) An orthoceras.

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