The Collaborative International Dictionary of English v.0.48:
Seafarer \Sea"far`er\, n. [Sea + fare.] One who follows the sea as a business; a mariner; a sailor. [1913 Webster]WordNet (r) 3.0 (2006):
seafarer n 1: a man who serves as a sailor [syn: mariner, seaman, tar, Jack-tar, Jack, old salt, seafarer, gob, sea dog]