In English law. Ancient custom. An export duty on wool, wool-felts, and leather, imposed during the reign of Edw. I. It was so called by way of distinction from an increased duty on the same articles, payable by foreign merchants, which was imposed at a later period of the same reign and was called “custuma nova.” 1 Bl. Comm. 314
Source: Black's Law Dictionary 2nd Ed (1910)
