Source : Webster's Revised Unabridged Dictionary (1913)

Jejunum \Je*ju"num\, n. [NL., fr. L. jejunus empty, dry.]
   (Anat.)
   The middle division of the small intestine, between the
   duodenum and ileum; -- so called because usually found empty
   after death.

Source : WordNet®

jejunum
     n : the part of the small intestine between the duodenum and the
         ileum