Definition of jejunum in English:



  • The part of the small intestine between the duodenum and ileum.

    • ‘Small bowel bleeding involving the jejunum and ileum is less common and more difficult to detect scintigraphically.’
    • ‘The midgut eventually develops into distal duodenum, jejunum, ileum, caecum, appendix, ascending colon, and proximal two thirds of the transverse colon.’
    • ‘The feathery-appearing bowel distal to the smoother contour duodenum is the jejunum, and it is in the right lower quadrant!’
    • ‘The jejunum and ileum, with the exception of the Brunner's glands, are basically similar to the duodenum, although they tend to have more diffuse lymphoid cell aggregates or nodules in their submucosa than does the duodenum.’
    • ‘Acute cholecystitis may cause the gall bladder to adhere to the adjacent jejunum or duodenum.’


Mid 16th century: from medieval Latin, neuter of jejunus fasting (because it is usually found to be empty after death).