Definitions

from The Century Dictionary.

  • noun 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.

from the GNU version of the Collaborative International Dictionary of English.

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

Etymologies

Sorry, no etymologies found.

Examples

  • Some of the ammonites, which belonged to this cuttle-fish group, soon attained a very considerable size; but a shell known as the orthoceras

    Falling in Love With Other Essays on More Exact Branches of Science

  • The “spoon” like one is an orthoceras which is an extinct species of my beloved cephalopods.

    Regretsy – I’m not seeing it

  • A stethoscope, a fossilized orthoceras, a karimba, marbles, a jar of slugs, a bag of shells.

    Teacher in wonderland

  • A stethoscope, a fossilized orthoceras, a karimba, marbles, a jar of slugs, a bag of shells.

    Archive 2009-08-01

  • In some natural marble samples, you can see all kinds of fossils like ammonites and orthoceras, natural history in a slab.

    TreeHugger

  • In some natural marble samples, you can see all kinds of fossils like ammonites and orthoceras, natural history in a slab.

    TreeHugger

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