Wa·ter·proof a. Proof against penetration or permeation by water; impervious to water; as, a waterproof garment; a waterproof roof.
1. A substance or preparation for rendering cloth, leather, etc., impervious to water.
2. 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.
Wa·ter·proof v. t. To render impervious to water, as cloth, leather, etc.
adj : not permitting the passage of water [syn: rainproof, waterproofed]
n 1: any fabric impervious to water
2: a water-resistant coat [syn: raincoat]
v : make watertight; "Waterproof the coat"