breviary

A service book containing the texts for the Christian liturgy of the hours recited in monasteries. It consists primarily of psalms, supplemented by hymns, readings and prayers.  See also: book of hours.

Screen Shot 2016-11-22 at 12.40.03 PMDetail of text from the Stowe Breviary. Stowe MS 12, folio 6 r. 1322-1325 and ca. 1350-1380.  British Library, London.