home w Mariel Britez waterproof wa⋅ter⋅proof [waw-ter-proof] –adjective 1. impervious to water. 2. rendered impervious to water by some special process, as coating or treating with rubber: a waterproof hat. –noun 3. Chiefly British. a raincoat or other outer coat impervious to water. 4. any of several coated or rubberized fabrics that are impervious to water. –verb (used with object) 5. to make waterproof. a b c d e f g h i j k l m n o p q r s t u v w x y z wait warpath waiting wall wash washing-machine washer waterfall watermelon waterproof weather water-canon wei-wou