Any of a group of broad-spectrum antibiotic drugs obtained from penicillium molds or produced synthetically,most active against gram-positive bacteria and used in the treatment of various infections and diseases.

• 青霉素，盘尼西林一种从青霉菌或人工合成青霉菌中提炼的广谱抗生素，能最有效地防治革兰氏阳性细菌且广泛运用于各种传染病和疾病的治疗中。