du ‧ o ‧ de ‧ num /ˌdjuːəˈdiːnəm $ ˌduːəˈdiːnəm, duˈɑːdn-əm/ BrE AmE noun [countable]
[ Date: 1300-1400 ; Language: Medieval Latin ; Origin: Latin duodeni 'twelve each' (because it is twelve finger-widths long) ]
the top part of your ↑ bowel , below your stomach
—duodenal /ˌdjuːəˈdiːnl◂ $ ˌduːəˈdiːnl◂, duˈɑːdn-əl/ adjective :
a duodenal ulcer