Definition of prophylaxis noun from the Oxford Advanced Learner's Dictionary

 

prophylaxis

 noun
noun
BrE BrE//ˌprɒfɪˈlæksɪs//
 
; NAmE NAmE//ˌprɑːfɪˈlæksɪs//
 
[uncountable](medical)
 
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action that is taken in order to prevent disease Word Origin mid 19th cent.: modern Latin, from pro- ‘before’ + Greek phulaxis ‘act of guarding’.
See the Oxford Advanced American Dictionary entry: prophylaxis