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- DictionaryPre·ven·ta·tive/prēˈven(t)ədiv/
adjective
- 1. designed to keep something undesirable such as illness, harm, or accidents from occurring; preventive: "a number of preventative measures are required"
noun
- 1. a medicine or other treatment designed to stop disease or ill health from occurring: "there are lots of proposed jet lag remedies and preventatives"