jejunum
noun
je·ju·num ji-ˈjü-nəm 
plural jejuna ji-ˈjü-nə
: the section of the small intestine that comprises the first two fifths beyond the duodenum and that is larger, thicker-walled, and more vascular and has more circular folds than the ileum
Example Sentences
Recent Examples on the Web The primary function of the jejunum is to absorb water and nutrients from food—specifically, sugars, amino acids, and fatty acids—so damage in this area can lead to nutrient deficiencies and diarrhea. 
SELF, 11 Feb. 2022 View Sample Sign Up Now Instead, the sugar and other components of fruit quickly move farther down the small intestine to the jejunum and ileum. Markham Heid, Time, 6 June 2018
SELF, 11 Feb. 2022 View Sample Sign Up Now Instead, the sugar and other components of fruit quickly move farther down the small intestine to the jejunum and ileum. Markham Heid, Time, 6 June 2018 Word History
Etymology
Middle English, from Medieval Latin, from neuter of Latin jejunus
First Known Use
14th century, in the meaning defined above
Medical Definition
jejunum
noun
je·ju·num ji-ˈjü-nəm
plural jejuna -nə
: the section of the small intestine that comprises the first two fifths beyond the duodenum and that is larger, thicker-walled, and more vascular and has more circular folds and fewer Peyer's patches than the ileum
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