Res nullins
Defined in 1 dictionary — Black's (1910)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
The property of nobody. A thing which has no owner, either because a former owner has finally abandoned it or because it has never been appropriated by any person or because (in the Roman law) it is not susceptible of private ownership.
Defined under Res mobiles in Black's Law Dictionary.