Definition of waterproof

• a. - Proof against penetration or permeation by water; impervious to water; as, a waterproof garment; a waterproof roof.
• n. - A substance or preparation for rendering cloth, leather, etc., impervious to water.
• n. - 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.
• v. t. - To render impervious to water, as cloth, leather, etc.