Source : Webster's Revised Unabridged Dictionary (1913)

Catgut \Cat"gut`\, n. [Cat + gut.]
   1. A cord of great toughness made from the intestines of
      animals, esp. of sheep, used for strings of musical
      instruments, etc.

   2. A sort of linen or canvas, with wide interstices.

Source : WordNet®

catgut
     n 1: perennial subshrub of eastern North America having downy
          leaves yellowish and rose flowers and; source of
          rotenone [syn: {goat's rue}, {wild sweet pea}, {Tephrosia
          virginiana}]
     2: a strong cord made from the intestines of sheep and used in
        surgery [syn: {gut}]