Horologion
liturgical book
Quick Summary
The horologion is a liturgical book used in the Eastern Church that contains the daily offices. It is the equivalent of the Western breviary. The word "horologion" comes from the Greek word for timepiece. A related term, "horologium," can also refer to a timepiece or, in Medieval Latin, the horologion itself. A "book of hours" is a similar concept, containing prayers for canonical hours.123
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