Sailor

n. mariner, seaman, seafarer, one who works on a ship

A sailor or mariner is a person who navigates water-born vessels or assists in their operation, maintenance, or service. The term can apply to professional mariners, military personnel, and recreational sailors as well as a plethora of other uses.Professional mariners hold a variety of professions and ranks which are fairly standard, with the exception of slight naming differences around the world. Common categories by department include the Deck department, the Engineering department, and the Steward's department. Mariners can also be categorized by status as a senior licensed mariners or unlicensed mariners.
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Noun
1. any member of a ship's crew
(synonym) crewman
(hypernym) skilled worker, trained worker
(hyponym) hand
(derivation) sail
2. a serviceman in the navy
(synonym) bluejacket, navy man, sailor boy
(hypernym) serviceman, military man, man, military personnel
(hyponym) coastguardsman
(derivation) sail
3. a stiff straw hat with a flat crown
(synonym) boater, leghorn, Panama, Panama hat, skimmer, straw hat
(hypernym) hat, chapeau, lid

(n.)
One who follows the business of navigating ships or other vessels; one who understands the practical management of ships; one of the crew of a vessel; a mariner; a common seaman.
  

Occasional West Coast equivalent of hello, world; seems to have originated at SAIL, later associated with the game Zork (which also included "hello, aviator" and "hello, implementor"). Originally from the traditional hooker's greeting to a swabbie fresh off the boat, of course.
[Jargon File]