What is the meaning of Waterproof?

Resistant to the effects of water.

Made of or covered with material that doesn't allow water in.

Incapable of failing; unassailable.

To make waterproof or water-resistant.

A substance or preparation for rendering cloth, leather, etc., impervious to water.

Cloth made waterproof, or any article made of such cloth, or of other waterproof material, as rubber; especially, an outer garment made of such material.

waterproof

waterproof (all senses)

a waterproof cloak

Source: wiktionary.org