Niger Liber
Defined in 3 dictionaries — Cyclopedic (1922), Black's (1910), Black's (1891)
The Cyclopedic Law Dictionary
Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The black book of register in the exchequer; chartularies of abbeys, cathedrals, etc.
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
Tbe black book or register in the exchequer; chartularles of abbeys, cathedrals, etc.
A Dictionary of Law
Henry Campbell Black · 1891
The black book er register in the exchequer; chartularies of abbeys, cathedrals, ete.