preventive (also preventative)

n thing (esp a medicine) used or designed to prevent sth 预防物; 预防性措施; （尤指）预防药.

prettify, prettily, prettiness, pretty, pretty-pretty, pretzel, prevail, prevail over, prevailing, prevalence, prevalent, prevaricate, prevarication, prevaricator, prevent, prevent...from, prevent...from..., preventable, prevention, preventive, preventive detention, preview, previous, previously, prey, prey on, price, price control, price war, price-fixing, price-list, price-tag, priceless, pricey (also pricy), pricing, prick, pricking, prickle, prickly / 5prIklI; `prIklI/, pride,