pulmonat

‖n. pl. [ NL., from L. pulmo, -onis, a lung. ] (Zool.) 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. [ 1913 Webster ]