large order of gastropods usually breathing by means of a lung-like sac comprising most land snails and slugs and many freshwater snails
source: WordNet 3.0
An extensive division, or sub-class, of hermaphrodite gastropods, in which the mantle cavity is modified into an air-breathing organ, as in Helix, or land snails, Limax, or garden slugs, and many pond snails, as Limnæa and Planorbis.
