kəˈlistə̇n, kō- noun
( -s )
Etymology: colist- (from New Latin colistinus , specific epithet of the bacterium producing it) + -in
: a polymyxin antibiotic produced by a bacterium of the genus Bacillus ( B. polymyxa var. colistinus ) and used against some gram-negative pathogens especially of the genera Pseudomonas, Escherichia, Klebsiella , and Shigella