methicillin
noun/ˌmeθɪˈsɪlɪn/
/ˌmeθɪˈsɪlɪn/
[uncountable]- a drug that can be used against infections where penicillin is not effectiveWord Origin1960s: from meth(yl) and (pen)icillin.
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methicillin
Definition of methicillin noun from the Oxford Advanced Learner's Dictionary