a polypeptide hormone secreted by the upper intestinal lining, that activates the gallbladder and pancreas: its presence in the brain is associated with loss of appetite
See cholecystokinin in American Heritage Dictionary 4
noun Abbr. CCK
A 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.