• WordNet 3.6
    • n secretin a gastrointestinal hormone that stimulates the secretion of water and bicarbonate from the pancreas and bile ducts whenever the stomach empties too much acid into the small intestine
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Century Dictionary and Cyclopedia
    • n secretin A peculiar substance which is derived from the mucous membrane of the intestinal tract and, after absorption into the blood-current, stimulates the pancreas and possibly also the salivary glands to secretion. The substance is supposedly present in the epithelial cells of the intestinal mucosa in an inactive form which is termed prosecretin. Of its chemical nature nothing is known, but it appears certain that secretin is not a ferment.
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In literature:

As mentioned elsewhere, some consider the function of the water-soluble vitamine analogous to that of secretin.
"Scurvy Past and Present" by Alfred Fabian Hess

In news:

*The Starling equation, describing fluid shifts in the body (1896) *The discovery of secretin, the first hormone, with Bayliss (1902) and the introduction of the concept of hormones (1905).