prophylactic
adjective /ˌprɒfəˈlæktɪk/
/ˌprəʊfəˈlæktɪk/
(medical- done or used in order to prevent a disease
预防疾病的 - prophylactic treatment
预防性治疗
词源late 16th cent.: from French prophylactique, from Greek prophulaktikos, from pro ‘before’ + phulassein ‘to guard’. - prophylactic treatment