Etymology
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waterproof (adj.)

also water-proof, 1725, from water (n.1) + proof (n.). Noun meaning "garment of waterproof material" is from 1799. The verb is first recorded 1843. Related: Waterproofed; waterproofing.

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Definitions of waterproof
1
waterproof (n.)
any fabric impervious to water;
waterproof (n.)
a water-resistant coat;
Synonyms: raincoat
2
waterproof (v.)
make watertight;
3
waterproof (adj.)
not permitting the passage of water;
Synonyms: rainproof / waterproofed
From wordnet.princeton.edu