/ Dictionary / Index T TRH: Meaning and Definition of Find definitions for: TRH Pronunciation: [key] thyrotropin-releasing hormone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: trh (Thesaurus) TRF tri- Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language