Webster’s Revised Unabridged Dictionary · 1913
Menaion
Me·na′ion (mē·nā′yŏn), n.; pl. Menaia (-yå). [NL., from Gr. μηναῖος 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.