Definition of "sea dog" [sea• dog]

• Any of various seals or similar marine mammals. (noun)
• Nautical A very experienced sailor. (noun)
• See fogbow. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Ernie was already settled in the ersatz salty sea dog atmosphere of the Lubber’s Club at South Street Seaport when I arrived just before six."