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.

1960–65; meth(yl) + (pen)icillin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
methicillin (ˌmɛθɪˈsɪlɪn)
a semisynthetic penicillin used to treat various infections

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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Example sentences
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.
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