A mariner or sailor, one who mans a ship. Opposed to landman or landsman.
An enlisted rate in the United States Navy and United States Coast Guard, ranking below petty officer third class and above seaman apprentice.
A person of the lowest rank in the Navy, below able seaman.
A merman; the male of the mermaid.
The steersman on a ship.
A driver of an automobile, especially a getaway vehicle in a criminal enterprise.