orthoceras

Or*thoc"e*ras, n. Etym: [NL., fr. Gr. (Paleon.) Defn: An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa.

orthoceras - Similar Words

orthoptera orthoclase orthoceratite porthors octocera orthopteran orthocenter theocrasy otherways northeast