waterproof

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Impervious to or unaffected by water.
2. adj. Made of or coated or treated with rubber, plastic, or a sealing agent to prevent penetration by water.
3. n. A material or fabric that is impervious to water.
4. n. Chiefly British A raincoat or other such outer garment.
5. v. To make impervious to water.

Century Dictionary and Cyclopedia

1. Impervious to water, or nearly so
2. n. Any material which repels water; especially, a light woolen cloth made for the purpose, and subjected to some waterproofing application.
3. n. A garment of some material that repels water, made either of waterproof , or of mackintosh or a similar material made with india-rubber.
4. To render impervious to water, as cloth, leather, etc.

Wiktionary

1. adj. Unaffected by water.
2. adj. Made of or covered with material that doesn't allow water in.
3. v. To make waterproof or water-resistant.

GNU Webster's 1913

1. adj. Proof against penetration or permeation by water; impervious to water.
2. n. A substance or preparation for rendering cloth, leather, etc., impervious to water.
3. n. 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.
4. v. To render impervious to water, as cloth, leather, etc.

WordNet 3.0

1. n. a water-resistant coat
2. adj. not permitting the passage of water
3. n. any fabric impervious to water
4. v. make watertight