A stringed instrument of music. This word is found in the titles of Psalm 8, 81, 84. In these places the LXX. render the word by "on the wine-fats." The Targum explains by "on the harp which David brought from Gath." It is the only stringed instrument named in the titles of the Psalms.

Noah Webster's New International Dictionary of the English Language

(n.) A musical instrument, of unknown character, supposed by some to have been used by the people of Gath, and thence obtained by David. It is mentioned in the title of Psalms viii., lxxxi., and lxxxiv.