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preventative (adj.)

1650s, from prevent + -ative. OED points out that preventive is better-formed. As a noun, from 1774.

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Definitions of preventative from WordNet
1
preventative (n.)
remedy that prevents or slows the course of an illness or disease;
the doctor recommended several preventatives
preventative (n.)
any obstruction that impedes or is burdensome;
preventative (n.)
an agent or device intended to prevent conception;
Synonyms: contraceptive / preventive / contraceptive device / prophylactic device / birth control device
2
preventative (adj.)
tending to prevent or hinder;
Synonyms: preventive
preventative (adj.)
preventing or contributing to the prevention of disease;
From wordnet.princeton.edu