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English definition of “prophylactic”

prophylactic

adjective     /ˌprɒf.ɪˈlæk.tɪk/ US  /ˌprɑː.fɪ-/ specialized
preventing disease: Some dentists are convinced that the addition of fluoride in water is ineffective as a prophylactic treatment.Passing on illness and causing disease
(Definition of prophylactic adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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