Psalms
WordNet
noun
(1) An Old Testament book consisting of a collection of 150 Psalms
WiktionaryText
Proper noun
- A book of the Old Testament of the Bible, and of the Tanakh.
Usage notes
Each "chapter" of the Book of Psalms is actually an individual psalm — an individual poem or hymn. Thus, when referring to a specifically numbered Psalm, the singular is preferred. It is Psalm 23, and not Psalms 23.