*vi·rus/`vaɪrəs; ˈvaɪərəs/ n [C] 1 a very small living thing that causes diseases, or an illness caused by this 病毒; 病毒性疾病: the common cold virus 普通感冒病毒 2 a set of instructions secretly put into a computer, that can destroy information stored in the computer 电脑病毒