/ Dictionary / Index T trinitroglycerin: Meaning and Definition of Find definitions for: tri•ni•tro•glyc•er•in Pronunciation: (trī-nī"trō-glis'ur-in), [key] — n. Chem. nitroglycerin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: trinitroglycerin (Thesaurus) trinitrocresol trinitrophenol Related Content Daily Word Quiz: supercilious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language