1 a chemical which people use to give them pleasant or exciting feelings. It is illegal in many countries to use drugs 毒品: He doesn't drink or take drugs. 他一不喝酒，二不吸毒。She suspected her son was on drugs. 她怀疑自己的儿子吸毒。hard drugs such as heroin and cocaine 海洛因、可卡因等烈性毒品soft drugs 软毒品（不易成瘾的毒品）

2 a chemical which is used as a medicine 药物: drug companies 制药公司Some drugs can only be obtained with a prescription from a doctor. 有些药品没有医生的处方是买不到的。