Medical Definition of incretin
: any of various gastrointestinal hormones that stimulate the secretion of insulin by the pancreas The actions of incretins depend on glucose concentration, and their function ceases when serum glucose level is less than 55 mg/dL …—Renee E. Amori et al., The Journal of the American Medical Association, 11 July 2007 … ingested nutrients stimulate the release of gut peptides called incretins, which enhance secretion of the hormone insulin, the main controller of blood glucose levels.—Joshua P. Thaler and David E. Cummings, Nature, 24 Apr. 2008
Seen and Heard
What made you want to look up incretin? Please tell us where you read or heard it (including the quote, if possible).