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cholecystokinin cho·le·cys·to·ki·nin (kō'lĭ-sĭs'tə-kī'nĭn)
A polypeptide hormone produced principally by the small intestine in response to the presence of fats, causing contraction of the gallbladder, release of bile, and secretion of pancreatic digestive enzymes. Also called pancreozymin.