/ Dictionary / Index T thyrotropin: Meaning and Definition of Find definitions for: thy•ro•tro•pin Pronunciation: (thī"ru-trō'pin, thī-ro'tru-), [key] — n. Biochem. an anterior pituitary hormone that regulates the activity of the thyroid gland. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thyrotropin (Thesaurus) thyrotrophic thyrotropin-releasing hormone 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