source: Josuke Higashikata | JoJo's Bizarre Encyclopedia | FANDOM powered by Wikia

a person whose job it is to work as a member of the crew of a commercial or naval ship or boat, especially one who is below the rank of officer.

船員, 海員, 船乗り (!通例船長･航海士より下の船員をさす) ; 水夫, 下級船員; 水兵, 海軍軍人

usually with adjective or noun modifier a person who goes sailing as a sport or recreation:

ヨット乗り［セーリング］をする人.

e.g. she was a keen sailor.

(a good sailor/bad sailor) a person who rarely (or often) becomes sick at sea in rough weather.

〖形容詞を伴って〗船に…な人

sailorly adjective

mid 17th century: variant of obsolete sailer.