Psaltery

Psaltery - (Easton's Bible Dictionary)

A musical instrument, supposed to have been a kind of lyre, or a harp with twelve strings. The Hebrew word nebhel, so rendered, is translated "viol" in Isa. 5:12 (R.V., "lute"); 14:11. In Dan. 3:5, 7, 10, 15, the word thus rendered is Chaldaic, pesanterin, which is supposed to be a word of Greek origin denoting an instrument of the harp kind.

Psaltery - (Webster's 1828 Dictionary)

PSAL'TERY, n. [Gr.] An instrument of music used by the Hebrews,the form of which is not now known. That which is now used is a flat instrument in form of a trapezium or triangle truncated at the top, strung with thirteen chords of wire, mounted on two bridges at the sides, and struck with a plectrum or crooked stick.

Praise the Lord with harp; sing to him with the psaltery, and an instrument of ten strings. Psa 33.