(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.
Definition of Coustoumier
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Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
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Black's Law Dictionary: 2nd Edition