Duodenum

[doo-uh-dee-nuh m, dyoo-; doo-od-n-uh m, dyoo-] /ˌdu əˈdi nəm, ˌdyu-; duˈɒd n əm, dyu-/

noun, plural duodena
[doo-uh-dee-nuh, dyoo-, doo-od-n-uh, dyoo-] /ˌdu əˈdi nə, ˌdyu-, duˈɒd n ə, dyu-/ (Show IPA), duodenums. Anatomy, Zoology.
1.
the first portion of the small intestine, from the stomach to the jejunum.
/ˌdjuːəʊˈdiːnəm/
noun (pl) -na (-nə), -nums
1.
the first part of the small intestine, between the stomach and the jejunum
n.

late 14c., from Medieval Latin duodenum digitorium “space of twelve digits,” from Latin duodeni “twelve each.” Coined by Gerard of Cremona (d.1187), who translated “Canon Avicennae,” a loan-translation of Greek dodekadaktylon, literally “twelve fingers long,” the intestine part so called by Greek physician Herophilus (c.353-280 B.C.E.) for its length, about equal to the breadth of twelve fingers.

duodenum du·o·de·num (dōō’ə-dē’nəm, dyōō’-, dōō-ŏd’n-əm, dyōō-)
n. pl. du·o·de·nums or du·o·de·na (dōō’ə-dē’nə, dyōō’-, dōō-ŏd’n-ə, dyōō-)
The beginning portion of the small intestine, starting at the lower end of the stomach and extending to the jejunum.
du’o·de’nal (dōō’ə-dē’nəl, dyōō’-, dōō-ŏd’n-əl, dyōō-) adj.
duodenum
(d’ə-dē’nəm, d-ŏd’n-əm)
Plural duodena or duodenums
The beginning part of the small intestine, starting at the lower end of the stomach and extending to the jejunum.
duodenum [(dooh-uh-dee-nuhm, dooh-od-n-uhm)]

The first part of the small intestine, located just below the stomach. (See digestive system.)