/ Dictionary / Index T tuberculin: Meaning and Definition of Find definitions for: tu•ber•cu•lin Pronunciation: (too-bûr'kyu-lin, tyoo-), [key] — n. Med. a sterile liquid prepared from cultures of the tubercle bacillus, used in the diagnosis and, formerly, in the treatment of tuberculosis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: tuberculin (Thesaurus) tuberculate tuberculinize 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