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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.

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

Along with routine screening through mammography or MRI, some individuals with inherited genetic mutations that greatly increase breast cancer risk may choose preventive surgery, including prophylactic mastectomy.

From Science Daily • Jun. 6, 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

But more crucially, American military aid is prophylactic.

From Salon • Aug. 13, 2025

As regards the prophylactic treatment, it is unnecessary to repeat the remarks which we have made elsewhere upon the general principles of tonic and nutritive medication in neuralgias of every kind.

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




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