Dictionary

polymyxin

noun poly·myx·in \ˌpä-lē-ˈmik-sən\

Definition of POLYMYXIN

:  any of several toxic antibiotics obtained from a soil bacterium (Bacillus polymyxa) and active against gram-negative bacteria
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Origin of POLYMYXIN

International Scientific Vocabulary, from New Latin polymyxa, from poly- + Greek myxa mucus — more at mucus
First Known Use: 1947
Medical Dictionary

polymyxin

noun poly·myx·in \ˌpäl-i-ˈmik-sən\

Medical Definition of POLYMYXIN

:  any of several toxic antibiotics obtained from a soil bacterium of the genus Bacillus (B. polymyxa) and active against gram-negative bacteria

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