from The Century Dictionary and Cyclopedia
- A primary group of tectibranchiate gastropods, characterized by the development of either a large notæum or a true mantle, secreting a small external discoid shell. It includes the families Pleurobranchidæ Runcinidæ, and Umbrellidæ.
Sorry, no etymologies found.
Sorry, no example sentences found.
Wordnik is becoming a not-for-profit! Read our announcement here.