柯林斯詞典penicillin /?p?n??s?l?n/ 1. N-UNCOUNT Penicillin is a drug that kills bacteria and is used to treat infections. 青霉素 返回 penicillin劍橋詞典a type of antibiotic (= a medicine that kills bacteria ) 盤尼西林,青霉素 返回 penicillin