catgut

noun
🔊/ˈkætɡʌt/
🔊/ˈkætɡʌt/
(also gut)
[uncountable]
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  1. thin, strong string made from animals’ intestines and used in making musical instruments肠线(用于制乐器的弦)
    Word Originlate 16th cent.: the association with cat remains unexplained.