Duodenum

[,djuːə'diːnəm] or ['dʊə'dinəm]

(noun.) the part of the small intestine between the stomach and the jejunum.

Checked by Joseph--From WordNet

(n.) The part of the small intestines between the stomach and the jejunum. See Illust. of Digestive apparatus, under Digestive.

Checked by Lionel

n. the first portion of the small intestines so called because about twelve fingers'-breadth in length:—pl. Duodē′na.—adj. Duodē′nal.

Edited by Lancelot