1. Cord or string made from the dried intestines of animals (especially sheep), used for musical instrument strings, tennis rackets, and other purposes.
Usage: Usually used in plural form; Despite the name, traditionally made from sheep intestines rather than cat intestines
2. The strings of a musical instrument, especially a violin or guitar.
Usage: Informal or colloquial usage

Examples

• The violin's catguts produced a warm, resonant tone.
• Professional tennis players often prefer rackets strung with catguts for better control.
• The old guitar had catguts that needed to be replaced.
• Catguts have been used in musical instruments for centuries.
• The harp's catguts were carefully tuned before the concert.
• Modern synthetic strings have largely replaced traditional catguts in many applications.