Open English Wordnet
Nouns
(n)preventive, preventative, prophylacticremedy that prevents or slows the course of an illness or disease“the doctor recommended several preventatives”
(n)hindrance, hinderance, hitch, preventive, preventative, encumbrance, incumbrance, interferenceany obstruction that impedes or is burdensome
(n)contraceptive, preventive, preventative, contraceptive device, prophylactic device, birth control devicean agent or device intended to prevent conception
Adjectives
(s)preventive, preventative, prophylacticpreventing or contributing to the prevention of disease“preventive medicine”, “vaccines are prophylactic”, “a prophylactic drug”