vt to render impervious to water, as cloth, leather, ·etc.
2. waterproof ·noun a substance or preparation for rendering cloth, leather, ·etc., impervious to water.
3. waterproof ·adj proof against penetration or permeation by water; impervious to water; as, a waterproof garment; a waterproof roof.
4. waterproof ·noun 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.