Menologium (English: /mɛnəˈloʊdʒiəm/), also written menology, and menologe, is a service-book used in the Eastern Orthodox Church and those Eastern Catholic Churches which follow the Rite of Constantinople.
From its derivation from Greek μηνολόγιον, menológion, from mén "a month", via Latin , the literal meaning is "month-set"—in other words, a book arranged according to the months. Like a good many other liturgical terms (e.g., lectionary), the word has been used in several quite distinct senses.
Menologion has several different meanings:
One of the most important collections of this kind is that made by Symeon Metaphrastes. Father Delehaye and Albert Ehrhard working independently grouped together works which are really attributable to this author, but uncertainty remained to the provenance of his materials, and as to the relation between this collection and certain contracted biographies many of which exist among the manuscripts of our great libraries. The synaxaries, or histories for liturgical use, are nearly all extracted from the older Menologia, but Delehaye, who gave special attention to the study of this class of documents, considered that the authors of these compendia have added, though sparsely, materials of their own, derived from various sources. (See Delehaye in his preface to the "Synaxarium Eccles. Cp.", published as a Propylæum to the Acta Sanctorum for November, lix-lxvi.)