- Rain-resistant - Proof against penetration or permeation by water;
impervious to water; as, a waterproof garment; a waterproof roof. - A substance or preparation for rendering cloth,
leather, etc., impervious to water. - Cloth made waterproof, or any article made of such
cloth, or of other waterproof material, as rubber; esp., an outer
garment made of such material. - To render impervious to water, as cloth, leather,
etc.