Definitions for tyrothricin
a mixture of antibiotics applied locally to infections caused by Gram-positive bacteria
a mixture of the antibiotics tyrocidine and gramicidin, used topically to treat gram-positive bacterial infections
U.S. National Library of Medicine
A polypeptide antibiotic mixture obtained from Bacillus brevis. It consists of a mixture of three tyrocidines (60%) and several gramicidins (20%) and is very toxic to blood, liver, kidneys, meninges, and the olfactory apparatus. It is used topically.