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



BrE BrE//ˌdjuːəˈdiːnəm//
; NAmE NAmE//ˌduːəˈdiːnəm//
(pl. duodenums, duodena
BrE BrE//ˌdjuːəˈdiːnə//
; NAmE NAmE//ˌduːəˈdiːnə//
(anatomy) Internal anatomy
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the first part of the small intestine, next to the stomach compare ileum, jejunum See related entries: Internal anatomy Word Originlate Middle English: from medieval Latin, from duodeni ‘in twelves’, its length being equivalent to the breadth of approximately twelve fingers.
See the Oxford Advanced American Dictionary entry: duodenum