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

jejunum

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