Diurnal
A book, sometimes called a journal, used in the performance of the Divine Office, but containing only the daytime offices (lauds, prime, terce, sext, none, and vespers).
A book, sometimes called a journal, used in the performance of the Divine Office, but containing only the daytime offices (lauds, prime, terce, sext, none, and vespers). Its layout is like that of the Breviary or Antiphonal, and its text varies in accordance with use.
Michelle Brown. Understanding Illuminated Manuscripts, (Malibu, CA: J. Paul Getty Museum in association with the British Library, c1994).