catgutPronunciation: /ˈkatgʌt/Translate catgut | into Italian Definition of catgut noun [mass noun] a material used for the strings of some musical instruments, made of the dried twisted intestines of sheep or horses (but not cats). Origin: late 16th century: the association with cat1 remains unexplainedcatgut in other Oxford dictionaries Definition of catgut in the US English dictionary