The American Heritage® Dictionary of the English Language, 4th Edition
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.
n. A nonprescription antibiotic, usually provided in topical ointment form and discovered as a product of the bacterium Bacillus subtilis.
the GNU version of the Collaborative International Dictionary of English
n. a polypeptide antibacterial antibiotic of known chemical structure effective against several types of Gram-positive organisms, and usually used topically for superficial local infection.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a polypeptide antibiotic of known chemical structure effective against several types of Gram-positive organisms; usually applied locally
Word Usage
"Oral antibiotics will treat it, as will Bactroban but not bacitracin; you need the prescription strength four times a day topically."