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

prophylaxis

noun
 
/ˌprɒfəˈlæksɪs/
 
/ˌprəʊfəˈlæksɪs/
[uncountable] (medical)
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  1. action that is taken in order to prevent disease
    Word Originmid 19th cent.: modern Latin, from pro- ‘before’ + Greek phulaxis ‘act of guarding’.
See prophylaxis in the Oxford Advanced American Dictionary
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