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- Dictionarydu·o·de·num/ˌdo͞oəˈdēnəm/
noun
- 1. the first part of the small intestine immediately beyond the stomach, leading to the jejunum.
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The duodenum is the first section of the small intestine in most higher vertebrates, including mammals, reptiles, and birds. In mammals it may be the principal site for iron absorption. The duodenum precedes the jejunum and ileum and is the shortest part of the small intestine. Wikipedia