Main Entry: je·ju·num

Pronunciation: \ji-ˈjü-nəm\

Function: noun

Inflected Form(s): plural je·ju·na\-nə\

Etymology: Middle English, from Medieval Latin, from neuter of Latin jejunus

Date: 14th century

: 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