Strong's #5568: psalmos (pronounced psal-mos')
 from 5567; a set piece of music, i.e. a sacred ode (accompanied with the voice, harp or other instrument; a "psalm"); collectively, the book of the Psalms:--psalm. Compare 5603.
Thayer's Greek Lexicon:
 ́ 
 
  psalmos 
 
 1) a striking, twanging
 
 1a) of a striking the chords of a musical instrument
 1b) of a pious song, a psalm
 
  Part of Speech: noun masculine
Relation: from G5567
  Citing in TDNT: 8:489, 1225
 
Usage:
This word is used 7 times:
Luke 20:42: "saith in the book  of Psalms, The Lord said unto my"
Luke 24:44: "and in the prophets, and  in the psalms, concerning me."
Acts 1:20: "it is written in the book  of Psalms, Let his habitation be desolate,"
Acts 13:33: "written in the second  psalm, Thou art my"
1 Corinthians 14:26: "every one of you hath  a psalm, hath a doctrine, hath a tongue,"
Ephesians 5:19: "Speaking to yourselves  in psalms and hymns and spiritual songs,"
Colossians 3:16: "and admonishing one another  in psalms and hymns and spiritual"