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small intestine
noun
: the narrow part of the intestine that lies between the stomach and colon, consists of duodenum, jejunum, and ileum, secretes digestive enzymes, and is the chief site of the digestion of food into small molecules which are absorbed into the body
Examples of small intestine in a Sentence
Recent Examples on the Web
Doctors used to think that peptic ulcers — open sores in the stomach’s lining or the first section of the small intestine — were caused by stress or other lifestyle factors, like eating spicy foods.
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Alice Callahan, New York Times, 22 Jan. 2025
The autoimmune response that causes damage to the small intestine may also affect pain messages to the brain.
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Daniel More, Verywell Health, 17 Jan. 2025
About 70% of all GI bleeds occur in the upper GI tract—the esophagus (the tube that connects your mouth to your stomach), stomach, or duodenum (the first part of the small intestine).
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Lindsay Curtis, Health, 11 Jan. 2025
The researchers used nanoparticles containing small interfering RNAs (siRNAs) that, when swallowed, are delivered to the small intestine.
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New Atlas, 14 Oct. 2024
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Word History
First Known Use
1767, in the meaning defined above
Dictionary Entries Near small intestine
Cite this Entry
“Small intestine.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/small%20intestine. Accessed 7 Feb. 2025.
Kids Definition
small intestine
noun
: the long narrow part of the intestine between the stomach and the colon in which food is mostly digested, from which digested food is absorbed into the body, and which consists of the duodenum, jejunum, and ileum
Medical Definition
small intestine
noun
: the part of the intestine that lies between the stomach and colon, consists of duodenum, jejunum, and ileum, secretes digestive enzymes, and is the chief site of the absorption of digested nutrients
called also small bowel
More from Merriam-Webster on small intestine
Nglish: Translation of small intestine for Spanish Speakers
Britannica.com: Encyclopedia article about small intestine
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