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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 is a gut hormone released after a meal, which helps digestion and reduces appetite. Alternative names for cholecystokinin Cholecystokinin used to be known as pancreozymin due to its actions on the pancreas but now it is commonly abbreviated to CCK; CCK-PZ.holecystokinin used to be known as pancreozymin due to its actions on the pancreas but now it is commonly abbreviated to CCK; CCK-PZ.