cho·le·cys·to·ki·nin (<A HREF="http://www.atomica.com/lookup_a6/pronkey.html">ko'li-sis't?-ki'nin</A>)
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