1. A veteran sailor.
2. A harbor seal.
3. A pirate or privateer.
4. A faint rainbow-like formation seen in foggy conditions. Also called mistbow, fogbow, and white rainbow.
From sea + dog, from use of the word dog as a playful term to refer to someone, as in old dog. Earliest documented use: 1598.
“But seadog Cyril Howarth — who is nicknamed Admiral Cyril — fears his days navigating his favourite waters could be torpedoed after an investigation was launched by canal bosses.”
Paul Fielding; Fylde Sailor Builds Nazi Submarine; The Gazette (Blackpool, UK); Oct 7, 2010.
“Forget the seadogs that Captain Hook unleashed on the Lost Boys. Forget Long John Silver and his parrot. The most famous brigands debuted in 1879.”
Lawrence Bommer; Light Opera revives Pirates of Penzance; Chicago Tribune; Dec 20, 2002.
Explore “seadog” in the Visual Thesaurus.