waterproof

[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

waterproofer, noun
waterproofness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
waterproof (ˈwɔːtəˌpruːf)
 
adj
1.  water-repellent Compare water-resistant not penetrable by water
 
n
2.  chiefly (Brit) a waterproof garment, esp a raincoat
 
vb
3.  to make (a fabric, item of clothing, etc) waterproof

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

waterproof
1736, from water + proof. The verb is first recorded 1843.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Builders stabilized the tower and added flashing to make it waterproof.
The bags are waterproof and dustproof and you can pocket several on every
  flight when the cabin crew are not looking.
The scientists say it's similar to weaving waterproof fabric.
The slabs are designed to be retrofitted in place of existing flooring and,
  being waterproof, can be used inside or outdoors.
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