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Adjective prophylactic has 3 senses
  1. contraceptive, prophylactic, antifertility - capable of preventing conception or impregnation; "contraceptive devices and medications"
    Antonym: unprotective (indirect, via protective)
  2. cautionary, preventive, prophylactic - tending to ward off; "the swastika...a very ancient prophylactic symbol occurring among all peoples"- Victor Schultze
    Antonym: unprotective (indirect, via protective)
  3. preventive, preventative, prophylactic - preventing or contributing to the prevention of disease; "preventive medicine"; "vaccines are prophylactic"; "a prophylactic drug"
    Antonym: unhealthful (indirect, via healthful)
Noun prophylactic has 2 senses
  1. preventive, preventative, prophylactic - remedy that prevents or slows the course of an illness or disease; "the doctor recommended several preventatives"
    --1 is a kind of remedy, curative, cure
  2. condom, rubber, safety, safe, prophylactic - contraceptive device consisting of a thin rubber or latex sheath worn over the penis during intercourse
    --2 is a kind of contraceptive, preventive, preventative, contraceptive device, prophylactic device, birth control device
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