catgut

[kat-guht]
noun
  1. a strong cord made by twisting the dried intestines of animals, as sheep, used in stringing musical instruments and tennis rackets, for surgical sutures, etc.
  2. goat's-rue.

Origin of catgut

1590–1600; apparently cat + gut, though allusion is obscure
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for catgut

catgut

noun
  1. a strong cord made from the dried intestines of sheep and other animals that is used for stringing certain musical instruments and sports rackets, and, when sterilized, as surgical ligaturesOften shortened to: gut
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for catgut
n.

1590s, altered from kitgut, probably from obsolete kit (n.2) "fiddle" + gut (n.). It was made from the intestines of sheep.

Online Etymology Dictionary, © 2010 Douglas Harper

catgut in Medicine

catgut

[kătgŭt′]
n.
  1. A tough, thin cord made from the treated and stretched intestines of certain animals, especially sheep, and used for surgical ligatures.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.