Definition and background:
A folk instrument popular in Russia, the balalaika is related to the lute, with a long, fretted neck, a triangular body, and three strings. triangular instrument, popular in Russia, having three strings tuned in fourths. Is played, either solo or with other instruments for folk music.
For more information on the music term "Balalaika" check out these other resources:
Wikipedia - Glossary of Musical Terminology
Virginia Tech Multimedia Music Dictionary
ORB -- Medieval Music Glossary