Definition of jejunum noun from the Oxford Advanced Learner's Dictionary

 

jejunum

 noun
noun
BrE BrE//dʒɪˈdʒuːnəm//
 
; NAmE NAmE//dʒɪˈdʒuːnəm//
 
(anatomy)
 
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the second part of the small intestine compare duodenum, ileum Word Origin mid 16th cent.: from medieval Latin, neuter of jejunus ‘fasting’ (because it is usually found to be empty after death).
See the Oxford Advanced American Dictionary entry: jejunum