Definition of duodenum noun from the Oxford Advanced American Dictionary

 

duodenum

 noun
noun
NAmE//ˌduəˈdinəm//
 
, NAmE//duˈɑdn̩əm//
 
(pl. duodenums or duodena
NAmE//ˌduəˈdinə//
 
, NAmE//duˈɑdn̩ə//
 
)
(anatomy)
 
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the first part of the small intestine, next to the stomach compare ileum, jejunum
NAmE//ˌduəˈdinl//
 
, NAmE//duˈɑdn̩əl//
 
adjective a duodenal ulcer
See the Oxford Advanced Learner's Dictionary entry: duodenum