Definition of Free Ice
All ice in navigable streams not included within that authorized to be appropriated is sometimes called "free” ice, and does not belong to the adjacent riparian owners, but to the person who first appropriates it. Hudson River Ice Co. v. Brady, 158 App.Div. 142, 142 N.Y.S. 819, 821.
That's the definition of Free Ice in Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.