Definition of prophylactically adverb from the Oxford Advanced Learner's Dictionary

 

prophylactically

 adverb
adverb
BrE BrE//ˌprɒfɪˈlæktɪkli//
 
; NAmE NAmE//ˌprɑːfɪˈlæktɪkli//
 
(medical)
 
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in a way that is intended to prevent a disease All employees were advised to take antibiotics prophylactically.