adjective. used of mollusks, especially gastropods, as snails etc..
noun. a class of mollusks typically having a one-piece coiled shell and flattened muscular foot with a head bearing stalked eyes.
1. Noun, singular or mass A chiton’s eight shell plates provide protection from marine predators and rough seas, while a snail’s univalve (one-piece) shell protects it similarly on land.
