bac·i·tra·cin (b s  -tr  sn)n. A polypeptide antibiotic obtained from a strain of a bacterium (Bacillus subtilis) and used as a topical ointment in the treatment of certain bacterial infections, especially those caused by cocci. [baci(llus) + Margaret Tracy, an American child in whose blood it was first isolated + -in.] |
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| Noun | 1. | bacitracin - a polypeptide antibiotic of known chemical structure effective against several types of Gram-positive organisms; usually applied locally antibiotic, antibiotic drug - a chemical substance derivable from a mold or bacterium that can kill microorganisms and cure bacterial infections; "when antibiotics were first discovered they were called wonder drugs" |
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