sterilize
sterilise, / ˈsterəlaɪz; `stɛrəˌlaɪz/ v [Tn]
1 make (sth) sterile(4) or free from bacteria 为（某物）消毒或杀菌
sterilized milk 消毒牛奶
sterilized surgical instruments消过毒的外科手术器械.
2 make (a person or an animal) unable to produce young or children (esp by removal or obstruction of the reproductive organs) 使（人）绝育; 使（动物）失去生殖能力
After her fourth child she decided to be/have herself sterilized. 她生了第四个孩子後决定做绝育手术.