pre·ven·tive 
/prɪˈvɛntɪv/ adjective
/prɪˈvɛntɪv/ adjective : used to stop something bad from happening
▪ Farmers are covering their crops as a preventive measure against frost. ▪ preventive medicine [=medicine that stops you from getting sick; medicine that keeps you healthy] ▪ We'll take whatever preventive action is necessary.
▪ Farmers are covering their crops as a preventive measure against frost. ▪ preventive medicine [=medicine that stops you from getting sick; medicine that keeps you healthy] ▪ We'll take whatever preventive action is necessary.
— preventive noun, plural preventives [count]
▪ The drug is used as a preventive against cancer.
▪ The drug is used as a preventive against cancer.
