du·​o·​de·​num | \ ˌdü-ə-ˈdē-nəm How to pronounce duodenum (audio) , du̇-ˈä-də-nəm How to pronounce duodenum (audio) also (ˌ)dyü- \
plural duodena\ ˌdü-​ə-​ˈdē-​nə How to pronounce duodenum (audio) , du̇-​ˈä-​də-​nə \ or duodenums

Definition of duodenum

: the first part of the small intestine extending from the pylorus to the jejunum

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Other Words from duodenum

duodenal \ ˌdü-​ə-​ˈdē-​nᵊl How to pronounce duodenum (audio) , du̇-​ˈä-​də-​nəl How to pronounce duodenum (audio) \ adjective

Examples of duodenum in a Sentence

Recent Examples on the Web Most ulcers, both in the stomach and the duodenum, are due to an infection called Helicobacter pylori, which was discovered in the 1980s. Dr. Keith Roach, oregonlive, 31 May 2021 The tube is inserted through the patient’s mouth and stomach, then into the first part of the small intestine, called the duodenum. Roni Caryn Rabin, New York Times, 6 Aug. 2019 Duke University researchers have observed rudimentary, but functional, stomachs, small intestines, and duodenums growing inside cancerous lungs — illustrating how varied and plastic these metastatic cells can be. Meghana Keshavan, STAT, 29 Mar. 2018 He was hospitalized, but physicians were unaware of a perforated duodenum, a portion of the small intestine, the complaint says. Megan Cassidy, azcentral, 9 Mar. 2018 The researchers speculate that bacteria may invade pancreatic tumors by migrating from the duodenum, the top section of the small intestine. Beth Mole, Ars Technica, 17 Sep. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'duodenum.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of duodenum

14th century, in the meaning defined above

History and Etymology for duodenum

Middle English, from Medieval Latin, from Latin duodeni twelve each, from duodecim twelve; from its length, about 12 fingers' breadth

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The first known use of duodenum was in the 14th century

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Cite this Entry

“Duodenum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/duodenum. Accessed 23 Oct. 2021.

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English Language Learners Definition of duodenum

: the part of the small intestine that is right below your stomach


du·​o·​de·​num | \ ˌd(y)ü-ə-ˈdē-nəm How to pronounce duodenum (audio) , d(y)u̇-ˈäd-ᵊn-əm How to pronounce duodenum (audio) \
plural duodena\ -​ˈdē-​nə, -​ᵊn-​ə How to pronounce duodenum (audio) \ or duodenums

Medical Definition of duodenum

: the first, shortest, and widest part of the small intestine that in humans is about 10 inches (25 centimeters) long and that extends from the pylorus to the undersurface of the liver where it descends for a variable distance and receives the bile and pancreatic ducts and then bends to the left and finally upward to join the jejunum near the second lumbar vertebra

Other Words from duodenum

duodenal \ -​ˈdēn-​ᵊl How to pronounce duodenum (audio) , -​ᵊn-​əl How to pronounce duodenum (audio) \ adjective

More from Merriam-Webster on duodenum

Britannica.com: Encyclopedia article about duodenum


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