seadog

noun

1. A sailor accustomed to the sea.

   “The old seadog knew the storm was coming long before the rest of the crew were aware of it.”

   “The two admiral-ambassadors were themselves two worlds apart. Kirk, now deceased, remained very much a seadog in both speech and mannerism. He was curt and seldom smiled, while Wright, a bit hard of hearing, was always courteous.”

2. A pirate.
3. (Scotland, archaic)A seal, especially a harbor seal. (marine mammal)
4. A charge resembling the talbot but with scales, webbed feet and a broad tail.
5. (informal)Synonym of sea puppy.

   “Sea Dogs (Otherwise known as Harbor Seals)”

6. A dogfish.
7. (uncommon)An omen of bad luck.
8. (uncommon)A white-topped wave in an estuary.
9. (uncommon)A fogbow, as seen by mariners.