From Longman Dictionary of Contemporary Englishbalalaikabal‧a‧lai‧ka /ˌbæləˈlaɪkə/ noun [countable] 
APMa musical instrument like a guitar, with a body shaped like a triangle and three strings, played especially in Russia
APMa musical instrument like a guitar, with a body shaped like a triangle and three strings, played especially in RussiaExamples from the Corpus
balalaika• Three women holding guitars and a balalaika sit in front of it.Origin balalaika (1700-1800) Russian 