
1) Catholic liturgical book
Found on
https://www.crosswordclues.com/clue/directorium

Directorium is a Latin word meaning guide; in the later Middle Ages it came to be specially applied to liturgical guides for the recitation of Office and Mass. ==Early history== For example, in the early part of the fifteenth century one Clement Maydeston, probably following earlier foreign precedents, adopted the title `Directorium Sacerdotum` .....
Found on
http://en.wikipedia.org/wiki/Directorium
No exact match found.