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English definition of “prophylactic”

prophylactic

adjective uk   /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.

prophylactic

noun [C] uk   /ˌprɒf.ɪˈlæk.tɪk/ us    /ˌprɑː.fɪ-/
specialized medical something that is intended to prevent disease mainly US a condom
(Definition of prophylactic from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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