/ Dictionary / Index B bacitracin: Meaning and Definition of Find definitions for: bac•i•tra•cin Pronunciation: (bas"i-trā'sin), [key] — n. Pharm. an antibiotic polypeptide derived by the hydrolytic action of Bacillus subtilis on protein, primarily used topically in the treatment of superficial infections caused by susceptible Gram-positive organisms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bacitracin (Thesaurus) Bacillus thuringiensis* back Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language