From Wiktionary, the free dictionary
dünn (“lean”) + Darm (“intestine”)
Dünndarm m (strong, genitive Dünndarmes or Dünndarms, plural Dünndärme)
- (anatomy) small intestine
Declension of Dünndarm [masculine, strong]
- “Dünndarm” in Duden online
- “Dünndarm” in Digitales Wörterbuch der deutschen Sprache