NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,790 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.

ileum
(IH-lee-um)
The last part of the small intestine. It connects to the cecum (first part of the large intestine). The ileum helps to further digest food coming from the stomach and other parts of the small intestine. 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.