NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,777 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

duodenum
(DOO-ah-DEE-num)
The first part of the small intestine. It connects to the stomach. The duodenum helps to further digest food coming from the stomach. It absorbs nutrients (vitamins, minerals, carbohydrates, fats, proteins) and water from food so they can be used by the body.

EnlargeDrawing of the small intestine showing the duodenum, jejunum, and ileum. Also shown are the stomach, appendix, colon, and rectum.

The small intestine connects the stomach and the colon. It includes the duodenum, jejunum, and ileum.