CATGUT

catgut. Catgut, n. a kind of canvas, a gut for fiddlestrings

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Cat″gut′ (?), n. [[Cat + gut.]] 1. 1. A cord of great toughness made from the intestines of animals, esp. of sheep, used for strings of musical instruments, etc.
2. 2. A sort of linen or canvas, with wide interstices.