Fairway
Defined in 2 dictionaries — Ballentine's (1916), Bouvier (1914)
Ballentine's Law Dictionary
James A. Ballentine · 1916
The navigable part of a harbor or river.
Bouvier's Law Dictionary and Concise Encyclopedia
John Bouvier; revised by Francis Rawle · 1914
Used to indicate the middle and deepest or most navigable channel. See Thalweg.