Wordnet 3.0
NOUN (1)
1.
the part of the small intestine between the stomach and the jejunum;
The Collaborative International Dictionary of English v.0.48:
Duodenum \Du`o*de"num\, n. [NL., fr. duodeni twelve each: cf. F.
duodenum. So called because its length is about twelve
fingers' breadth.] (Anat.)
The part of the small intestines between the stomach and the
jejunum. See Illust. of Digestive apparatus, under
Digestive.
[1913 Webster]
WordNet (r) 3.0 (2006):
duodenum
n 1: the part of the small intestine between the stomach and the
jejunum