镇痛药近义词与同义词按词义分组列出,使用时请结合具体语境。a synthetic narcotic drug (trade name Demerol) used to treat pain杜冷丁盐酸麦佩里定a medicine used to relieve pain止痛剂止痛药镇痛剂remedy that eases pain and discomfort止痛剂缓和剂镇静剂