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- (Received Pronunciation) IPA(key): /ˌɒk.səˈsɪl.ɪn/
- (General American) IPA(key): /ˌɑk.səˈsɪl.ɪn/
- Rhymes: -ɪlɪn
- (pharmacology) A narrow-spectrum beta-lactam antibiotic made by chemical modification of penicillin and administered in the form of its hydrated sodium salt C19H18N3NaO5S·H2O to treat infections caused by penicillin-resistant staphylococci.