Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Medieval Latin
Origin: Latin duodeni 'twelve each' (because it is twelve finger-widths long)

duodenum

 noun
     
Related topics: Human
du‧o‧de‧num [countable]
HBH the top part of your bowel, below your stomach
—duodenal adjective:
a duodenal ulcer
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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