vaccine
/ˈvæksiːn/noun
1- Medicine a substance used to stimulate the production of antibodies and provide immunity against one or several diseases, prepared from the causative agent of a disease, its products, or a synthetic substitute, treated to act as an antigen without inducing the disease【医】疫苗, 菌苗：
there is no vaccine against HIV infection.
现在还没有预防人体免疫缺损病毒感染的疫苗。
1.1
- Computing a program designed to detect computer viruses, and prevent them from operating【计算机】杀毒软件。
词源
late 18th cent.: from Latin vaccinus, from vacca 'cow' (because of the early use of the cowpox virus against smallpox).