The word catgut may have been an abbreviation of the word "cattlegut". Alternatively, it may derive by folk etymology from kitgut or kitstring — the word kit, meaning fiddle, having at some point been confused with the word kit for a young cat.
- (countable) A cord of great toughness made from the intestines of animals, especially of sheep, used for strings of musical instruments, etc.
- (uncountable) The material from which such cords are made.
- (uncountable) A sort of linen or canvas, with wide interstices.