[ pol-ee-mik-sin ]
/ ˌpɒl iˈmɪk sɪn /

noun Pharmacology.

any of various polypeptide antibiotics derived from Bacillus polymyxa.

Origin of polymyxin

1945–50; <New Latin polymyx(a) specific epithet (<Greek poly-poly- + mýxa mucus, slime) + -in2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for polymyxin

/ (ˌpɒlɪˈmɪksɪn) /


any of several polypeptide antibiotics active against Gram-negative bacteria, obtained from the soil bacterium Bacillus polymyxa

Word Origin for polymyxin

C20: from New Latin Bacillus polymyxa; see poly-, myxo-, -in
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for polymyxin

[ pŏl′ē-mĭksĭn ]


Any of various mainly toxic antibiotics derived from strains of the soil bacterium Bacillus polymyxa and used to treat various infections with gram-negative bacteria.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.