Source : Webster's Revised Unabridged Dictionary (1913)

Gastropod \Gas"tro*pod\, n. (Zo["o]l.)
   One of the Gastropoda. [Written also {gasteropod}.]

Source : WordNet®

gastropod
     n : a class of mollusks typically having a one-piece coiled
         shell and flattened muscular foot with a head bearing
         stalked eyes [syn: {univalve}]