preventive /prɪˈvɛntɪv/ adjective Learner's definition of PREVENTIVE
: used to stop something bad from happening预防的 -
Farmers are covering their crops as a preventive measure against frost.为防霜冻农民把庄稼盖上了。
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preventive medicine [=medicine that stops you from getting sick; medicine that keeps you healthy]预防医学
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We'll take whatever preventive action is necessary.我们将采取一切必要的防范措施。
— preventive
noun, plural preventives [count]