Slug

n. [ OE. slugge slothful, sluggen to be slothful; cf. LG. slukk low-spirited, sad, E. slack, slouch, D. slak, slek, a snail. ] 1. A drone; a slow, lazy fellow; a sluggard. Shak. [ 1913 Webster ]

2. A hindrance; an obstruction. [ Obs. ] Bacon. [ 1913 Webster ]

3. (Zool.) 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. [ 1913 Webster ]

4. (Zool.) Any smooth, soft larva of a sawfly or moth which creeps like a mollusk; as, the pear slug; rose slug. [ 1913 Webster ]

5. A ship that sails slowly. [ Obs. ] Halliwell. [ 1913 Webster ]

His rendezvous for his fleet, and for all slugs to come to, should be between Calais and Dover. Pepys. [ 1913 Webster ]

6. [ Perhaps a different word. ] An irregularly shaped piece of metal, used as a missile for a gun. [ 1913 Webster ]

7. (Print.) A thick strip of metal less than type high, and as long as the width of a column or a page, -- used in spacing out pages and to separate display lines, etc. [ 1913 Webster ]

Sea slug. (Zool.) (a) Any nudibranch mollusk. (b) A holothurian. --
Slug caterpillar. Same as Slugworm. [ 1913 Webster ]