(ὡρολόγιον , literally Adial) is the title of one of the "office-books" of the orthodox Eastern Church. It contains the daily hours of prayer, so far as respects their immovable portions, and answers in a. measure to the Officium Hebdomade which is found at: the opening of each volume of the breviary of the Eastern Church. But it generally contains also other formularies of that Church. See Neale, Introduction to the Hist. of the Eastern Church, 2, 848. (See HOURS).