From WordNet (r) 3.0 (2006) [wn]:
waterproof
adj 1: not permitting the passage of water [syn: rainproof,
waterproof, waterproofed]
n 1: any fabric impervious to water
2: a water-resistant coat [syn: raincoat, waterproof]
v 1: make watertight; "Waterproof the coat"
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Waterproof \Wa"ter*proof`\, a.
Proof against penetration or permeation by water; impervious
to water; as, a waterproof garment; a waterproof roof.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Waterproof \Wa"ter*proof`\, n.
1. A substance or preparation for rendering cloth, leather,
etc., impervious to water.
[1913 Webster]
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.
[1913 Webster]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Waterproof \Wa"ter*proof`\, v. t.
To render impervious to water, as cloth, leather, etc.
[1913 Webster]