Webster's 1913 Dictionary
GASTROPODA
Gas *trop "o *da, n. pl. , Etym: [NL. , fr. Gr. -poda. ] (Zoöl.)
Defn: 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.
New American Oxford Dictionary
Gastropoda
Gas trop o da |ˌgastrəˈpōdə ˌɡæstrəˈpoʊdə |Zoology a large class of mollusks which includes snails, slugs, whelks, and all terrestrial kinds. They have a large muscular foot for movement and (in many kinds ) a single asymmetrical spiral shell. ORIGIN modern Latin (plural ), from Greek gastēr, gastr- ‘stomach ’ + pous, pod- ‘foot. ’
Oxford Dictionary
Gastropoda
Gastropoda |ˌgastrəˈpəʊdə, gasˈtrɒpədə | ▶plural noun Zoology a large class of molluscs which includes snails, slugs, whelks, and all terrestrial kinds. They have a large muscular foot for movement and (in many kinds ) a single asymmetrical spiral shell. ORIGIN modern Latin (plural ), from Greek gastēr, gastr- ‘stomach ’ + pous, pod- ‘foot ’.
The Wordsmith Dictionary