a hormone produced mainly in the hypothalamus and pancreas, or prepared synthetically, that inhibits the release of glucagon and insulin from the pancreas: used in treating diabetes
See somatostatin in American Heritage Dictionary 4
(sō-mătˌə-stătˈn, sōˌmə-tə-)
noun
A polypeptide hormone produced chiefly by the hypothalamus that inhibits the secretion of various other hormones, such as somatotropin, glucagon, insulin, thyrotropin, and gastrin.