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preventive (adj.)

"serving to prevent or hinder; guarding against or warding off," 1630s, from Latin praevent-, past-participle stem of praevenire "come or go before, anticipate" (see prevent), + -ive. As a noun, "something taken or done beforehand," from 1630s; in medical use from 1670s. Related: Preventively; preventiveness.

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