The Collaborative International Dictionary
Menaia
Menaion \Me*na"ion\, n.; pl. Menaia (-y[*a]). [NL., from Gr. ?
monthly.] (Eccl.)
A work of twelve volumes, each containing the offices in the
Greek Church for a month; also, each volume of the same.
--Shipley.
Wiktionary
menaia
n. (plural of menaion English) Often refers to a set of twelve volumes of meniaon.