from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. One of a pair of shelly plates found in some cephalopods, such as the ammonites.
from the GNU version of the Collaborative International Dictionary of English
- n. One of a pair of shelly plates found in some cephalopods, as the ammonites.
from The Century Dictionary and Cyclopedia
- n. One of the heart-shaped plates divided by a suture found in some fossil cephalopods, as goniatites and ammonites.
New Latin, from Ancient Greek for "unfolding". (Wiktionary)