Psalterium (book)
Encyclopedia
The Psalterium or Book of the Psalms
Psalms
The Book of Psalms , commonly referred to simply as Psalms, is a book of the Hebrew Bible and the Christian Bible...

 contains the bulk of the Divine Office
Liturgy of the hours
The Liturgy of the Hours or Divine Office is the official set of daily prayers prescribed by the Catholic Church to be recited at the canonical hours by the clergy, religious orders, and laity. The Liturgy of the Hours consists primarily of psalms supplemented by hymns and readings...

 of the Roman Catholic Church
Roman Catholic Church
The Catholic Church, also known as the Roman Catholic Church, is the world's largest Christian church, with over a billion members. Led by the Pope, it defines its mission as spreading the gospel of Jesus Christ, administering the sacraments and exercising charity...

.

The other books associated with it were the Lectionary
Lectionary
A Lectionary is a book or listing that contains a collection of scripture readings appointed for Christian or Judaic worship on a given day or occasion.-History:...

, the Antiphonary
Antiphonary
An Antiphonary, Antiphonal, "Antiphony" or Antiphoner is one of the present Catholic liturgical books. It is intended for use in choro An Antiphonary, Antiphonal, "Antiphony" or Antiphoner (Latin antiphonarium, antiphonarius, antiphonarius liber, antiphonale; Greek ’antíphonon, antiphon,...

, and Responsoriale, and the Hymnary.
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