bacitracin Bacis • backache · · · Info · Definitions · Characters · · bacitracin · · Text Latin · · Script 10 · · Length Definitions · · · (noun) a polypeptide antibiotic of known chemical structure effective against several types of Gram-positive organisms; usually applied locally. · · Noun Definition 1 Characters · · a latin small letter a U+0061 b latin small letter b U+0062 c latin small letter c U+0063 i latin small letter i U+0069 n latin small letter n U+006E r latin small letter r U+0072 t latin small letter t U+0074