Menaion
noun
Me·nai·on
mə̇ˈnāˌȯn
plural Menaia
-āə
: a collection of hymns and collects for all days of the year in the Eastern Orthodox Church arranged in calendar order and usually divided into 12 volumes each for a different month and each containing the proper of the immovable feasts of Christ or the saints for the month
also : any of these volumes
Word History
Etymology
Middle Greek mēnaion, from neuter of mēnaios monthly, from Greek mēn month