/ Dictionary / Index T TNB: Meaning and Definition of Find definitions for: TNB Pronunciation: [key] — Chem. Chem. trinitrobenzene, esp. the 1,3,5- isomer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. TN TNF Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language