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Definitions

prophylactic

[proh-fuh-lak-tik, prof-uh-] / ˌproʊ fəˈlæk tɪk, ˌprɒf ə- /
ADJECTIVE
protective
Synonyms


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Pet owners across the country have been advised they should treat their cats and dogs as a preventative measure every month, known as prophylactic use - although many veterinary organisations have now updated their advice.

From BBC • Jun. 10, 2026

Over a decade ago, Angelina Jolie made waves with her decision to undergo a prophylactic double mastectomy at the age of 37 after finding she had a BRCA1 mutation.

From The Wall Street Journal • Jun. 7, 2026

Volunteers were divided into two groups: prophylactic arm and therapeutic arm.

From Science Daily • Feb. 19, 2026

It also announced plans to buy Cidara Therapeutics, which is working on antiviral treatments, including a flu prophylactic in Phase 3, for $9.2 billion.

From MarketWatch • Feb. 3, 2026

Lastly, we have to speak of prophylactic measures, which really ought never to be thought of as a separate matter, but always as an essential and most important part of the treatment of neuralgia.

From Neuralgia and the Diseases that Resemble it by Anstie, Francis E.




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