四よん大だい公こう害がい病びょうMeaningsNoun1. the four major pollution-caused illnesses (Minamata disease, Niigata Minamata disease, Yokkaichi asthma, Itai-itai disease); four big pollution diseases of JapanKanji used四four大large公public害harm病illnessComposed of四よんfour; 4Numeric大だいlarge; big; great; huge; vast; major; important; serious; severe; prominent; …Prefix公こう害がいpollution; public nuisance; contaminationNoun病びょうdiseaseSuffix