bacitracin \bacitracin\ n. 1940 bacillus + margaret tracy, a
   child whose tissues contained bacillus subtilis + -in.
   --rhud.
   a polypeptide antibacterial antibiotic of known chemical
   structure effective against several types of gram-positive
   organisms, and usually used topically for superficial local
   infection.

   note: it is produced by bacillus subtilis and bacillus
         licheniformis, and as produced commercially is
         composed of several closely related substances. the
         predominant component, bacitracin a, has a formula
         c60h103n17o16s, and contains d-ornithine,
         d-phenylalanine and d-glutamine residues as well as the
         l-isomers of leucine, isoleucine, histidine, asparagine
         and aspartic acid. --mi11
         wordnet 1.5
see also:
bacillus subtilis bacillus licheniformis bacitracin a c60h103n17o16s