PREVENTATIVE
preventive, preventative, prophylactic
(adjective) preventing or contributing to the prevention of disease; “preventive medicine”; “vaccines are prophylactic”; “a prophylactic drug”
preventive, preventative
(adjective) tending to prevent or hinder
contraceptive, preventive, preventative, contraceptive device, prophylactic device, birth control device
(noun) an agent or device intended to prevent conception
hindrance, hinderance, hitch, preventive, preventative, encumbrance, incumbrance, interference
(noun) any obstruction that impedes or is burdensome
preventive, preventative, prophylactic
(noun) remedy that prevents or slows the course of an illness or disease; “the doctor recommended several preventatives”
Source: WordNet® 3.1
Adjective
preventative (comparative more preventative, superlative most preventative)
Alternative form of preventive
Noun
preventative (plural preventatives)
Alternative form of preventive
Usage notes
• Preventative is in all senses synonymous with preventive. Many speakers prefer to use preventative in noun senses and preventive in adjective senses.
Source: Wiktionary
Pre*vent"a*tive, n.
Definition: That which prevents; -- incorrectly used instead of preventive.
Source: Webster’s Unabridged Dictionary 1913 Edition