psalter (n.)

"the Book of Psalms," Middle English sauter, psauter, from Old English saltere, psaltere, Old French sautier, psaltier, and directly from Church Latin psalterium "the songs of David," in secular Latin, "stringed instrument played by twanging," from Greek psaltērion "stringed instrument, psaltery, harp," from psallein "to pluck, play on a stringed instrument" (see psalm).