Coustoumier
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
(Otherwise spelled "Gousturmer" or "Coutumier.") In old French law. A collection of customs, unwritten laws, and forms of procedure. Two such volumes are of especial importance in juridical history, viz., the Grand Coustumier de Normandie, and the Coutumier de France or Grand Coutumier.