jejunum

Definition of jejunum
National Cancer Institute

jejunum

(jeh-JYOO-num)
The middle part of the small intestine. It is between the duodenum (first part of the small intestine) and the ileum (last part of the small intestine). The jejunum 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.

Source: NCI Dictionary of Cancer Terms