/ Dictionary / Index T TB: Meaning and Definition of Find definitions for: TB Pronunciation: [key] tubercle bacillus. tuberculosis. Tb Pronunciation: [key] tubercle bacillus. tuberculosis. Tb Pronunciation: [key] — Symbol, Chem. terbium. t.b. Pronunciation: [key] trial balance. tubercle bacillus. tuberculosis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tb (Thesaurus) tazza T.B.A. Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language