Definition of duodenum in English:
 duodenum
nounPlural duodenums, Plural duodena ˌdjuːəˈdiːnəmˌd(j)uəˈdinəm
Anatomy The first part of the small intestine immediately beyond the stomach, leading to the jejunum.
 Example sentencesExamples
-  All this then enters the digestive tract and begins its passage from esophagus to stomach to duodenum to small intestine to colon.
 -  You may have to have part of your stomach, gall bladder and duodenum (the first bit of your small intestine) removed too.
 -  The distal duodenum and duodenal jejunal junction is especially susceptible to damage because it is fixed in position.
 -  Multiple biopsies were taken from the duodenum, the gastric antrum, and the distal esophagus.
 -  It is a tube approximately 20 feet long consisting of three regions; the duodenum, jejunum, and ileum.
 
Origin
  
Late Middle English: from medieval Latin, from duodeni 'in twelves', its length being equivalent to the breadth of approximately twelve fingers.
   Definition of duodenum in US English:
 duodenum
nounˌd(y)o͞oəˈdēnəmˌd(j)uəˈdinəm
Anatomy The first part of the small intestine immediately beyond the stomach, leading to the jejunum.
 Example sentencesExamples
-  Multiple biopsies were taken from the duodenum, the gastric antrum, and the distal esophagus.
 -  You may have to have part of your stomach, gall bladder and duodenum (the first bit of your small intestine) removed too.
 -  All this then enters the digestive tract and begins its passage from esophagus to stomach to duodenum to small intestine to colon.
 -  It is a tube approximately 20 feet long consisting of three regions; the duodenum, jejunum, and ileum.
 -  The distal duodenum and duodenal jejunal junction is especially susceptible to damage because it is fixed in position.
 
Origin
  
Late Middle English: from medieval Latin, from duodeni ‘in twelves’, its length being equivalent to the breadth of approximately twelve fingers.