duodenum

The first part of the small intestine, starting at the lower end of the stomach and extending to the jejunum.

Pronounced as (IPA)
/ˌdjuːə(ʊ)ˈdiːnəm/
Etymology

From Medieval Latin duodēnum digitōrum (“space of twelve digits”) in reference to its length, from duodēnī (“twelve each”) + digitōrum, genitive plural of digitus (“finger; toe; digit”).

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