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 It has largely been replaced by newer synthetic penicillin drugs that act similarly, such as dicloxacillin.
A derivative of penicillin formerly used esp. in treating staphylococcal infections resistant to penicillin.
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.
Origin of methicillin
- Blend of methoxy- (meth–) (oxy–) penicillin
From American Heritage Dictionary of the English Language, 5th Edition
- methi- +"Ž -cilin