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n. A narrow-spectrum beta-lactam antibiotic of the penicillin class, used to treat infections caused by susceptible gram-positive bacteria.

n. antibacterial (trade name Dynapen) used to treat staphylococcal infections that are resistant to penicillin

"In addition to methicillin, which has passed out of common use, the semi-synthetics include oxacillin used in laboratories to test for methicillin resistance, nafcillin, cloxacillin, dicloxacillin, and flucloxacillin."

bactericide    antibacterial drug    antibacterial