Leges non scriptæ
Defined in 1 dictionary — Black's (1910)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
In English law. Unwritten or customary laws, including those ancient acts of parliament which were made before time of memory. Hale, Com. Law, 5. See 1 Bl. Comm. 63, 64.
Defined under Leges in Black's Law Dictionary.