so·mat·o·stat·in 
(sō-măt′ə-stătn, sō′mə-tə-)
(sō-măt′ə-stătn, sō′mə-tə-)n.
A polypeptide hormone produced chiefly by the hypothalamus that inhibits the secretion of various other hormones, such as somatotropin, glucagon, insulin, thyrotropin, and gastrin.
[SOMATO(TROPIN) + -STAT + -IN.]