The Collaborative International Dictionary
Gittith
Gittith \Git"tith\, n. [Heb.]
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.
--Dr. W. Smith.
Wiktionary
gittith
n. (non-gloss definition: A musical term of uncertain meaning (possibly the name of an instrument), found in the Bible.)