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superbug

[soo-per-buhg]
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noun Informal.
  1. a pathogenic bacterium that has developed immunity to antibiotics, or an insect that has developed immunity to insecticides.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for superbug

superbug

noun
  1. informal an infective microorganism that has become resistant to antibiotics
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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

superbug in Medicine

superbug

(sōōpər-bŭg′)
n.
  1. Any of various disease-causing bacteria that develop a resistance to drugs normally used to control or eradicate them.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.