Definition of bluegrass noun from the Oxford Advanced Learner's Dictionary

 

bluegrass

 noun
noun
BrE BrE//ˈbluːɡrɑːs//
 
; NAmE NAmE//ˈbluːɡræs//
 
[uncountable] Styles of music
 
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a type of traditional American country music played on guitars and banjos See related entries: Styles of music
See the Oxford Advanced American Dictionary entry: bluegrass