decretal

n. [ LL. decretale, neut. of L. decretalis. See Decretal, a. ] 1. (R. C. Ch.) An authoritative order or decree; especially, a letter of the pope, determining some point or question in ecclesiastical law. The decretals form the second part of the canon law. [ 1913 Webster ]

2. (Canon Law) The collection of ecclesiastical decrees and decisions made, by order of Gregory IX., in 1234, by St. Raymond of Pennafort. [ 1913 Webster ]