a derivative of penicillin formerly used esp. in treating staphylococcal infections resistant to penicillin
Origin of methicillinmeth- + (pen)icillin
A synthetic antibiotic related to penicillin, C17H19N2O6NaS, 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 It has largely been replaced by newer synthetic penicillin drugs that act similarly, such as dicloxacillin.
Origin of methicillinBlend of methoxy- (meth– + oxy–) and penicillin.
methi- +"Ž -cilin