mə̇ˈnāˌȯn noun
( plural me·naia -āə)
Usage: usually capitalized
Etymology: Middle Greek mēnaion, from neuter of mēnaios monthly, from Greek mēn month — more at moon
: 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