Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “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)
Focus on the pronunciation of prophylactic

More definitions for “prophylactic”

Translations of “prophylactic”

Word of the Day


showing a wish to help or bring advantages to others, even if it results in disadvantage for yourself

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More