A seasoned seaman is an experienced sailor who has spent many years at sea. The term is often used to refer to a sailor who has been in the navy for a long time and is familiar with the duties of a sailor. The three crossword solutions for the term are TAR (3 letters), SALT (4 letters), and OLDSALT (7 letters). TAR stands for tarred rope, which is a type of rope used in sailing. SALT stands for saltwater, which is the main component of the ocean. OLDSALT stands for an experienced sailor, which is what a seasoned seaman is.