Any of several toxic antibiotics obtained from a particular soil bacterium

WordNet Word definitions in WordNet
n. any of several toxic antibiotics obtained from a particular soil bacterium

Wiktionary Word definitions in Wiktionary
n. Any of several toxic antibiotics, derived from the soil bacterium ''Bacillus polymyxa'', used to treat infections by gram-negative bacteria

Wikipedia Word definitions in Wikipedia
Polymyxins are antibiotics , with a general structure consisting of a cyclic peptide with a long hydrophobic tail. They disrupt the structure of the bacterial cell membrane by interacting with its phospholipids . They are produced by nonribosomal peptide ...