GASTROPODA
Gastropoda, class Gastropoda, Gasteropoda, class Gasteropoda
(noun) snails and slugs and their relatives
Source: WordNet® 3.1
Gas*trop"o*da, n. pl., Etym: [NL., fr. Gr. -poda.] (Zoöl.)
Definition: One of the classes of Mollusca, of great extent. It includes
most of the marine spiral shells, and the land and fresh-water
snails. They generally creep by means of a flat, muscular disk, or
foot, on the ventral side of the body. The head usually bears one or
two pairs of tentacles. See Mollusca. [Written also Gasteropoda.]
Note: The Gastropoda are divided into three subclasses; viz.: (a) The
Streptoneura or Dioecia, including the Pectinibranchiata,
Rhipidoglossa, Docoglossa, and Heteropoda. (b) The Euthyneura,
including the Pulmonata and Opisthobranchia. (c) The Amphineura,
including the Polyplacophora and Aplacophora.
Source: Webster’s Unabridged Dictionary 1913 Edition