Methicillin meaning

mĕth'ĭ-sĭl'ĭn
A synthetic antibiotic related to penicillin, C17 H19 N2 O6 NaS, used to treat infections caused by staphylococci that produce beta-lactamase and are therefore resistant to beta-lactam penicillin drugs. It has largely been replaced by newer synthetic penicillin drugs that act similarly, such as dicloxacillin.
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A derivative of penicillin formerly used esp. in treating staphylococcal infections resistant to penicillin.
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A semisynthetic penicillin, C17 H20 N2 O6 S, formerly used in the form of its sodium salt to treat infections caused by penicillinase-producing staphylococci.
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(pharmacology) An antibiotic drug, chemically related to penicillin, often used against strains of bacteria which have become resistant to penicillin.
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Origin of methicillin

  • Blend of methoxy- (meth–) (oxy–) penicillin
    From American Heritage Dictionary of the English Language, 5th Edition
  • methi- +"Ž -cilin
    From Wiktionary