'Prayer book' definitions:

Definition of 'prayer book'

noun

A book containing prayers [syn: prayer book, prayerbook]

From: GCIDE

Prayer \Prayer\ (?; 277), n. [OE. preiere, OF. preiere, F. pri[`e]re, fr. L. precarius obtained by prayer, fr. precari to pray. See Pray, v. i.]
1. The act of praying, or of asking a favor; earnest request or entreaty; hence, a petition or memorial addressed to a court or a legislative body. "Their meek preyere." --Chaucer [1913 Webster]
2. The act of addressing supplication to a divinity, especially to the true God; the offering of adoration, confession, supplication, and thanksgiving to the Supreme Being; as, public prayer; secret prayer. [1913 Webster]
As he is famed for mildness, peace, and prayer. --Shak. [1913 Webster]
3. The form of words used in praying; a formula of supplication; an expressed petition; especially, a supplication addressed to God; as, a written or extemporaneous prayer; to repeat one's prayers. [1913 Webster]
He made those excellent prayers which were published immediately after his death. --Bp. Fell. [1913 Webster]
Prayer book, a book containing devotional prayers.
Prayer meeting, a meeting or gathering for prayer to God. [1913 Webster]
Syn: Petition; orison; supplication; entreaty; suit. [1913 Webster]