Longman Dictionary of Contemporary English homepage

preventive

 adjective
     
pre‧vent‧ive also preventative [only before noun]
intended to stop something you do not want to happen, such as illness, from happening:
preventive health programs
preventive action/measure
While travelling abroad, take preventive measures to avoid illness.
—preventively adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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