poly·​myx·​in | \ ˌpä-lē-ˈmik-sən How to pronounce polymyxin (audio) \

Definition of polymyxin

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

Examples of polymyxin in a Sentence

Recent Examples on the Web After 30 days of exposure, the bacteria could tolerate doses of polymyxin B that were 256 times higher than the original amount, but the SCUBs remained effective at the same dose. Max G. Levy, Wired, 30 Nov. 2021 Instead, antibiotics commonly used in flu vaccine manufacturing include neomycin, kanamycin, polymyxin B and gentamicin. Anne P. Kim, The Conversation, 13 Nov. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'polymyxin.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of polymyxin

1947, in the meaning defined above

History and Etymology for polymyxin

International Scientific Vocabulary, from New Latin polymyxa, from poly- + Greek myxa mucus — more at mucus

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Time Traveler for polymyxin

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The first known use of polymyxin was in 1947

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Last Updated

10 Dec 2021

Cite this Entry

“Polymyxin.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/polymyxin. Accessed 18 Jan. 2022.

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More Definitions for polymyxin


poly·​myx·​in | \ ˌpäl-i-ˈmik-sən How to pronounce polymyxin (audio) \

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

More from Merriam-Webster on polymyxin

Britannica.com: Encyclopedia article about polymyxin


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