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

 

catgut

 noun
noun
BrE BrE//ˈkætɡʌt//
 
; NAmE NAmE//ˈkætɡʌt//
 
(also gut)[uncountable]
 
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thin strong string made from animals’ intestines and used in making musical instruments Word Origin late 16th cent.: the association with cat remains unexplained.
See the Oxford Advanced American Dictionary entry: catgut