Definition of prophylactic adjective from the Oxford Advanced Learner's Dictionary

 

prophylactic

 adjective
adjective
BrE BrE//ˌprɒfɪˈlæktɪk//
 
; NAmE NAmE//ˌproʊfəˈlæktɪk//
 
 
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(medical) done or used in order to prevent a disease prophylactic treatment Word Origin late 16th cent.: from French prophylactique, from Greek prophulaktikos, from pro ‘before’ + phulassein ‘to guard’.
See the Oxford Advanced American Dictionary entry: prophylactic

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