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Cholecystokinin definition, a hormone secreted by the upper portion of the intestine that stimulates contraction of the gallbladder and increases secretion of pancreatic juice. See more. Dictionary.com
They are both also important for secretion and flow of bile: 1  Cholecystokinin: The name of this hormone describes its effect on the biliary system - cholecysto = gallbladder and kinin = movement. 2  Secretin: This hormone is secreted in response to acid in the duodenum.