Definitions
1.nounA mariner or sailor, one who mans a ship. Opposed to landman or landsman.
2.nounA person of the lowest rank in the Navy, below able seaman.
3.nounAn enlisted rate in the United States Navy and United States Coast Guard, ranking below petty officer third class and above seaman apprentice.
4.nounA merman; the male of the mermaid.