Longman Dictionary of Contemporary English homepage

Topic: HUMAN

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

duodenum

noun
     
du‧o‧de‧num [countable]
HBH the top part of your bowel, below your stomach
duodenal adjective:
a duodenal ulcer
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