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

verb

1. To make waterproof or water-resistant.

adjective

1. Unaffected by water.

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

3. Incapable of failing; unassailable.

Synonyms: watertight