| Front | penicillin |pɛnɪˈsɪlɪn| |
|---|---|
| Back | noun 1 an antibiotic or group of antibiotics produced naturally by certain blue moulds, now usually prepared synthetically. Penicillin was discovered in 1928 and during the Second World War became the first antibiotic to be used by doctors. 2 a blue mould of a type that produces penicillin. |
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