/jiˈjo͞onəm/
Noun, pl. jejuna
(Anatomy)
1. The middle section of the small intestine in most higher vertebrates, including mammals, reptiles, and birds. In fish, the divisions of the small intestine are not as clear and the terms middle intestine or mid-gut may be used instead of jejunum. (wikipedia.org)
2. The central of the three divisions of the small intestine which lies between the duodenum and the ileum. (wiktionary.org)
3. The part of the small intestine between the duodenum and ileum. (Google Dictionary)
Word origin: From Latin ieiunum, neuter of ieiunus, “empty, dry, barren,” literally “fasting, hungry.”