- A taxonomic class inside the phylum Mollusca — the gastropods or univalves.
- among classes of Mollusca, of good extent. It offers almost all of the marine spiral shells, as well as the land and fresh-water snails. They generally creep by way of a flat, muscular disk, or base, on the ventral region of the human anatomy. The top often holds several sets of tentacles. See mollusca.
- snails and slugs and their family members