from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of the freshwater air-breathing mollusks belonging to Planorbis and allied genera, having shells of a discoidal form.
from the GNU version of the Collaborative International Dictionary of English
- n. Any fresh-water air-breathing mollusk belonging to Planorbis and other allied genera, having shells of a discoidal form.
from The Century Dictionary and Cyclopedia
- n. The typical genus of Planorbinæ.
From the genus name. (Wiktionary)