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"Psalter" Definition

noun

In the Roman Catholic Church, A rosary consisting of one hundred and fifty beads, corresponding to the number of the Psalms.
Source: Wiktionary
Specifically for Anglicans, the Book of Common Prayer which contains the Book of Psalms. For Catholics, the Breviary containing the Psalms arranged for each day of the week.
Source: Wiktionary
The Book of Psalms. Often applied to a book containing the Psalms separately printed.
Source: Wiktionary
The Book of .
A collection of Psalms for liturgical or devotional use.