cho·le·cys·to·ki·nin (k??l?-s?s?t?-k??n?n)n. 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.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.cholecystokinin (?k?l??s?st??ka?n?n) n (Biochemistry) a hormone secreted by duodenal cells that stimulates the contraction of the gall bladder and secretion of pancreatic enzymes. Also called: pancreozymin Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014cho?le?cys?to?ki?nin (?ko? l??s?s t??ka? n?n, ?k?l ?-) n. a hormone secreted by the upper intestine that stimulates contraction of the gallbladder and increases secretion of pancreatic juice. Abbr.: CCK [1925?30] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.cholecystokininA hormone that causes the gallbladder to contract and so release bile into the duodenum.Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited