\De*cre"tal\, a. [L. decretalis, fr. decretum. See
{Decree}.]
Appertaining to a decree; containing a decree; as, a decretal
epistle. --Ayliffe.

\De*cre"tal\, 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.
2. (Canon Law) The collection of ecclesiastical decrees and
   decisions made, by order of Gregory IX., in 1234, by St.
   Raymond of Pennafort.