Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

  • noun 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.
  • noun 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 the GNU version of the Collaborative International Dictionary of English.

  • noun (Anat.) The part of the small intestines between the stomach and the jejunum. See Illust. of Digestive apparatus, under digestive.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

  • noun the part of the small intestine between the stomach and the jejunum

Etymologies

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

[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.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

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").

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