noun Biochemistry.
a polypeptide hormone, produced in the small intestine, that activates the pancreas to secrete pancreatic juice.

1900–05; secrete1 + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
secretin (sɪˈkriːtɪn)
a peptic hormone secreted by the mucosae of the duodenum and jejunum when food passes from the stomach
[C20: from secretion + -in]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

secretin se·cre·tin (sĭ-krēt'n)
A polypeptide hormone produced in the duodenum, especially on contact with acid, that stimulates secretion of pancreatic juice.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica


a digestive hormone secreted by the wall of the upper part of the small intestine (the duodenum). Its secretion is stimulated when acid from the stomach or digested protein bathes the mucous tissue of the duodenum. Secretin, a protein of low molecular weight, evokes the discharge of fluid and bicarbonate ions from the pancreas; it also promotes the secretion of bile from the liver.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
At one time, there was enormous excitement about using secretin infusions.
Now, after many studies have been conducted in many laboratories, it's possible that secretin is not effective after all.
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