/ Dictionary / Index T thyrotropin-releasing hormone: Meaning and Definition of Find definitions for: thy•ro•tro'pin-re•leas•ing hor"mone Pronunciation: (thī"ru-trō'pin ri-lē"sing, thī-ro'tru-), [key] — Biochem. Biochem. a small peptide hormone, produced by the hypothalamus, that controls the release of thyrotropin by the pituitary. Also calledAbbr.: TRH Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. thyrotropin thyroxine Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language