se·cre·tin (s -kr t n)n. A polypeptide hormone produced in the duodenum, especially on contact with acid, to stimulate secretion of pancreatic juice. [secret(ion) + -in.] |
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| Noun | 1. | 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 gastrointestinal hormone, GI hormones - hormones that affect gastrointestinal functioning |
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