from the GNU version of the Collaborative International Dictionary of English
- n. An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa.
from The Century Dictionary and Cyclopedia
- n. The typical genus of Orthoceratidæ, having the shell straight or but slightly curved. The species are very numerous, ranging from the Silurian to the Liassic. Also Orthoceratites, Orthocerus.
Sorry, no etymologies found.
Some of the ammonites, which belonged to this cuttle-fish group, soon attained a very considerable size; but a shell known as the orthoceras
The “spoon” like one is an orthoceras which is an extinct species of my beloved cephalopods.
A stethoscope, a fossilized orthoceras, a karimba, marbles, a jar of slugs, a bag of shells.
In some natural marble samples, you can see all kinds of fossils like ammonites and orthoceras, natural history in a slab.