waterproof

waterproof
adj that cannot be penetrated by water 不透水的; 防水的
    waterproof fabric 防水织物. n garment made from waterproof fabric, esp a raincoat 用防水织物制成的衣服; （尤指）雨衣. v [Tn]
make (sth) waterproof 使（某物）防水.

牛津英汉双解词典