Waterproof

Part of speech: noun (n.)

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.

Part of speech: verb (v.)

To render impervious to water, as cloth, leather, etc.

Part of speech: adjective (a.)

Proof against penetration or permeation by water; impervious to water; as, a waterproof garment; a waterproof roof.