nafcillin

== English == === Etymology === From naph(thalene) +‎ -cillin (“6-aminopenicillanic acid derivative”). === Pronunciation === (General American) IPA(key): /næfˈsɪl.ɪn/ Rhymes: -ɪlɪn === Noun === nafcillin (uncountable) (pharmacology) A semisynthetic penicillin that is resistant to beta-lactamase and is used especially in the form of its hydrated sodium salt C21H21N2NaO5S·H2O as an antibiotic. === References === “nafcillin”, in Merriam-Webster.com Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.