Meaning of “prophylactic” in the English Dictionary

"prophylactic" in British English

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uk /ˌprɒf.ɪˈlæk.tɪk/ us /ˌprɑː.fɪˈlæk.tɪk/ specialized

preventing disease:

Some dentists are convinced that the addition of fluoride in water is ineffective as a prophylactic treatment.

prophylacticnoun [ C ]

uk /ˌprɒf.ɪˈlæk.tɪk/ us /ˌprɑː.fɪˈlæk.tɪk/

(Definition of “prophylactic” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)