Webster's Revised Unabridged Dictionary · 1913

Seaman

Seaman , noun

A merman; the male of the mermaid. [Rare]
Not to mention mermaids or seamen. — Locke

Seaman , noun

[Anglo-Saxon saeman.]

One whose occupation is to assist in the management of ships at sea; a mariner; a sailor; -- applied both to officers and common mariners, but especially to the latter. Opposed to landman, or landsman.
Collocations (2)
Able seaman , a sailor who is practically conversant with all the duties of common seamanship.
Ordinary seaman , See Ordinary.