Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The beginning portion of the small intestine, starting at the lower end of the stomach and extending to the jejunum.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The first part of the small intestine, starting at the lower end of the stomach and extending to the jejunum.

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

  • n. In anatomy, the first portion of the small intestine, in immediate connection with the stomach, receiving the hepatic and pancreatic secretions, and usually curved or folded about the pancreas.
  • n. In entomology, a short smooth portion of the intestine, between the ventriculus and the ileum, found in a few coleopterous insects. Some entomotomists, however, apply this name to the ventriculus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the part of the small intestine between the stomach and the jejunum

Etymologies

Middle English, from Medieval Latin, short for intestīnum duodēnum digitōrum, intestine of twelve finger-widths (in length), from Latin duodēnum, genitive pl. of duodēnī, twelve each, from duodecim, twelve; see duodecimal.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Medieval Latin (from the phrase duodēnum digitōrum ("space of twelve digits"), in reference to its length), from duodēnī ("twelve each") + digitōrum, genitive plural of digitus ("finger, toe, digit"). (Wiktionary)

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