Movable freehold
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
A term applied by Lord Coke to reni property which is capable of being increased or diminished by natural causes; as where the owner of seashore acquires or loses land as the waters recede or approach.
See Holman v. Hodges, 112 Iowa, 714, 84 N. W. 950, 58 In R. A. 673, 84 Am. St Rep. 367.