Definition

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

Other Definitions

This word also has 2 other definitions:

WATERPROOF (noun)

1. A substance or preparation for rendering cloth, leather, etc., impervious to water. 2. Cloth made waterproof, or any article made of such cloth, o...

WATERPROOF (verb)

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