noun Pharmacology.

  1. a crystalline, water-insoluble antibiotic obtained from tyrothrycin by extraction, used chiefly in treating local infections caused by Gram-positive organisms.


  1. an antibiotic used in treating local Gram-positive bacterial infections: obtained from the soil bacterium Bacillus brevis


  1. An antibiotic produced by a Bacillis bacterium and used to treat certain gram-positive bacteria infections.
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