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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.