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[meth-uh-sil-in] /ˌmɛθ əˈsɪl ɪn/
noun, Pharmacology
a semisynthetic penicillin antibiotic, C 1 7 H 1 9 N 2 NaO 6 S, used principally in the treatment of severe, penicillin-resistant staphylococci infections.
Origin of methicillin
1960-65; meth(yl) + (pen)icillin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for methicillin
  • The infections were resistant to many common antibiotics, including methicillin.
  • As penicillin's effectiveness waned, doctors turned to methicillin, a more powerful antibiotic.
  • For more than a decade, as the germ grew resistant to methicillin, doctors have battled it with vancomycin.
British Dictionary definitions for methicillin


a semisynthetic penicillin used to treat various infections
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
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methicillin in Medicine

methicillin meth·i·cil·lin (měth'ĭ-sĭl'ĭn)
A synthetic antibiotic related to penicillin and most commonly used in treatment of infections caused by staphylococci that produce penicillinase.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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