A pathological condition of a part, an organ, or a system of an organism resulting from various causes, such as infection, genetic defect, or environmental stress, and characterized by an identifiable group of signs or symptoms.

• 病，疾病有机体的某一部位、某一器官或系统处于病理状态，由各种因素引起，如传染、遗传缺陷或环境紧张，而且以被视为相同的一组表象或症状为特征