prophylactic in WordNet English dictionary

1. capable of preventing conception or impregnation
   "contraceptive devices and medications"
   contraceptive  prophylactic  antifertility 
   
2. warding off
   "the swastika...a very ancient prophylactic symbol occurring among all peoples"- Victor Schultze
   cautionary  prophylactic 
   
3. preventing or contributing to the prevention of disease
   "preventive medicine"; "vaccines are prophylactic"; "a prophylactic drug"
   preventive  preventative  prophylactic 
   

1. contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse
   condom  rubber  safety  safe  prophylactic 
   
2. remedy that prevents or slows the course of an illness or disease
   "the doctor recommended several preventatives"
   preventive  preventative  prophylactic