RhymeZone: seadog definitions

Definitions of seadog:

noun: A sailor accustomed to the sea.
noun: A pirate.
noun: (archaic) A seal. (marine mammal)
noun: (heraldry) A charge resembling the talbot but with scales, webbed feet and a broad tail.
noun: A dogfish.
noun: (uncommon) An omen of bad luck.
noun: (uncommon) A white-topped wave in an estuary.
noun: (uncommon) A fogbow, as seen my mariners.

(Definitions from Wiktionary)