Lex Non Scripta
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
(Lat.) Law not written; unwritten law; a law originating plied to the common law of England, not in the literal sense of an unwritten or oral law, but in that of a law not derived from express legislative enactment.
1 Bl. Comm. 63, 64, 67.