Noun

(en noun)

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.

(archaic) A seal (marine mammal), or a similar design in heraldry.

dogfish

(uncommon) An omen of bad luck.

(uncommon) A white-topped wave in an estuary.

Noun

(seamen)

A mariner or sailor, one who mans a ship. Opposed to landman or landsman.

* {{quote-magazine, date=2012-03

, author=William E. Carter, Merri Sue Carter , title=The British Longitude Act Reconsidered , volume=100, issue=2, page=87 , magazine= citation , passage=But was it responsible governance to pass the Longitude Act without other efforts to protect British seamen ? Or might it have been subterfuge—a disingenuous attempt to shift attention away from the realities of their life at sea.}}

(British, Navy) The lowest ranking in the Navy, below Able Seaman.

(US, Navy) An enlisted rate in the United States Navy and United States Coast Guard, ranking below petty officer third class and above seaman apprentice.

A merman; the male of the mermaid.

Not to mention mermaids or seamen. — .