3. (Zoöl.) Any one of numerous species of terrestrial pulmonate
mollusks belonging to Limax and several related genera, in which the
shell is either small and concealed in the mantle, or altogether
wanting. They are closely allied to the land snails.
4. (Zoöl.) Any smooth, soft larva of a sawfly or moth which creeps like
a mollusk; as, the pear slug; rose slug.