1. A book containing prayers or forms of devotion.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• orayer book,
• lrayer book,
• -rayer book,
• 0rayer book,
• peayer book,
• pdayer book,
• pfayer book,
• ptayer book,
• p5ayer book,
• p4ayer book,
• przyer book,
• prsyer book,
• prwyer book,
• prqyer book,
• prater book,
• prager book,
• praher book,
• prauer book,
• pra7er book,
• pra6er book

The adjective form of "prayer book" is "prayer book".

The plural form of "prayer book" is "prayer books".

The singular form of the word "prayer book" is "prayer book".