Pronunciation: (thī"ru-trō'pin ri-lē"sing, thī-ro'tru-), [key] Biochem.
a small peptide hormone, produced by the hypothalamus, that controls the release of thyrotropin by the pituitary. Also called thy•ro•tro'pin-re•leas•ing fac"tor. Abbr.: TRH
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.