\Wa"ter*man\, n.; pl. {Watermen}.
1. A man who plies for hire on rivers, lakes, or canals, or
   in harbors, in distinction from a seaman who is engaged on
   the high seas; a man who manages fresh-water craft; a
   boatman; a ferryman.

2. An attendant on cab stands, etc., who supplies water to
   the horses. [Eng.] --Dickens.

3. A water demon. --Tylor.