viomycin n a basic polypeptide antibiotic (trade name Viocin) administered intramuscularly (along with other drugs) in the treatment of tuberculosis Usage(s) A new antibiotic and an old one made medical news last week: Announcing the isolation of viomycin (named for the violet color of the Cuban soil mold in which it was. It has hopes for a new antibiotic, viomycin, as a possible cure for tuberculosis. Synonym(s) Viocin