jejunum jejunotomy • jelab · · · Info · Definitions · Characters · · jejunum · · Text Latin · · Script 7 · · Length Definitions · · · (noun) the part of the small intestine between the duodenum and the ileum. · · Noun Definition 1 Characters · · e latin small letter e U+0065 j latin small letter j U+006A m latin small letter m U+006D n latin small letter n U+006E u latin small letter u U+0075