What's the difference between menaion and menology?

Menaion

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Definition:

• (n.) A work of twelve volumes, each containing the offices in the Greek Church for a month; also, each volume of the same.

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Menology

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Definition:

• (n.) A register of months.
• (n.) A brief calendar of the lives of the saints for each day in the year, or a simple remembrance of those whose lives are not written.

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