from the GNU version of the Collaborative International Dictionary of English
- n. An extinct genus of large, fossil, bivalve shells, allied to the mussels. The genus is characteristic of the Cretaceous period.
from The Century Dictionary and Cyclopedia
- n. A genus of fossil bivalve mollusks of the family Aviculidæ, characteristic of the Cretaceous period.
Sorry, no etymologies found.