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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
Cholecystokinin (CCK) Cholecystokinin (CCK), formerly called pancreozymin, a digestive hormone released with secretin when food from the stomach reaches the first part of the small intestine (duodenum).