Definition of penicillin noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌpenɪˈsɪlɪn//
; NAmE NAmE//ˌpenɪˈsɪlɪn//
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a substance obtained from mould, used as a drug to treat or prevent infections caused by bacteria; a type of antibiotic The doctor put me on a course of penicillin. a strain of bacteria resistant to penicillin Word Originfrom the modern Latin genus name Penicillium, from Latin penicillus ‘paintbrush’ (because of the brush-like fruiting bodies) + -in.
See the Oxford Advanced American Dictionary entry: penicillin