from the GNU version of the Collaborative International Dictionary of English
- n.pl. An artificial division of gastropods, including those that have an entire aperture.
from The Century Dictionary and Cyclopedia
- A division of pectinibranchiate gastropodous mollusks, with shells having the mouth entire, and not notched or prolonged into a siphon: opposed to Siphonostomata.
- In Infusoria, same as Pantostomata.
Sorry, no etymologies found.