prophylactic
[proh-fuh-lak-tik, prof-uh-] /ˌproʊ fəˈlæk tɪk, ˌprɒf ə-/
adjective
1. defending or protecting from disease or infection, as a drug.
2. preventive or protective.
noun
3. Medicine/Medical. a prophylactic medicine or measure.
4. a preventive.
5. a device, usually a...