Waterproof (definition)

wa·ter·proof

[waw-ter-proof, wot-er-] 

–adjective

1. impervious to water.

2. rendered impervious to water by some special process, as coating or treating with rubber: a waterproof hat.

 

–noun

3. Chiefly British . a raincoat or other outer coat impervious to water.

4. any of several coated or rubberized fabrics that are impervious to water.

 

–verb (used with object)

5. to make waterproof.

 

Origin:
1730–40; water + -proof