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|Noun||1.||penicillinase-resistant antibiotic - a form of penicillin that is not rendered inactive by penicillinase|
Nafcil, nafcillin - a penicillinase-resistant form of penicillin (trade name Nafcil) used (usually in the form of its sodium salt) to treat infections caused by penicillin-resistant strains of staphylococci
oxacillin - a form of penicillin resistant to penicillinase and effective against penicillin-resistant staphylococci
penicillin - any of various antibiotics obtained from Penicillium molds (or produced synthetically) and used in the treatment of various infections and diseases