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Psalter (church Latin psalterium from ancient Greek ψαλτήριον psaltḗrion , to psalm ) is:

  • a book of the Old Testament, the Book of Psalms
  • a medieval liturgical text book with psalms and chants, see Psalter (text book)
  • a two- or four-week recurring cycle in the Prayer of the Hours of the Catholic Church, in which the psalms are prayed once
  • when praying the rosary in the Catholic Church the combination of the laws of all the secrets of the rosary, see rosary
  • a medieval musical instrument in the style of the zither without a fingerboard, see Psalterium
  • Omasum , in the anatomy of the ruminant leaf stomach