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.
an antibiotic used mainly in treating bacterial skin infections: obtained from the bacterium Bacillus subtilis
bacitracin bac·i·tra·cin (bās’ĭ-trā’sĭn)
A polypeptide antibiotic obtained from a strain of the bacterium Bacillus subtilis and used as a topical treatment for certain bacterial infections, especially those caused by cocci.
- Back forty
remote, usually uncultivated acreage on a large piece of land, as on a farm or ranch.
a pain, especially in the lumbar region of the back, usually caused by the strain of a muscle or ligament. Historical Examples After headache, backache, and loss of appetite comes usually a mild diarrhœa. Preventable Diseases Woods Hutchinson Did a man ever have a backache like the dragging, pulling, tearing ache of a woman? Treatise […]
- Back against the wall
see: back to the wall
- Back alley
dirty, unprepossessing, sordid, or clandestine: back-alley morals; back-alley political schemes. Contemporary Examples Just around the corner from stores like Chanel, Valentino, and Hermès—not exactly a back alley. My Illegal, Flammable, Fabulous Hair Treatment Laura Bennett July 9, 2009 Historical Examples Thus, and not in treacled cadences, intrigued Mariar and Sir Thomas in the back alley. […]