A "prayer book" is a book that contains prayers and religious texts that people use to guide their worship and communication with a higher power. Full definition
If one is sensitive to tone, reading many of the hip prayer books of the past ten years is disturbing. (religion-online.org)
Not long ago, and I'm sure you remember it as if it were yesterday, I wrote about my search for the perfect prayer book. (firstthings.com)
WLQ misfires in England include the defeats of the Church of England Prayer Book in 1927 — 1928 and four votes on hospital and higher education funding in 2003 — 2004. (blog.politics.ox.ac.uk)