[waw-ter-proof, wot-er-]


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


Chiefly British. a raincoat or other outer coat impervious to water.
any of several coated or rubberized fabrics that are impervious to water.

verb (used with object)

to make waterproof.

Nearby words

  1. watermark,
  2. watermeal,
  3. watermelon,
  4. watermill,
  5. waterpick,
  6. waterproofing,
  7. waters,
  8. waters, muddy,
  9. waters, territorial,
  10. watersaver

Origin of waterproof

First recorded in 1730–40; water + -proof

Related formswa·ter·proof·er, nounwa·ter·proof·ness, noun

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for waterproof

British Dictionary definitions for waterproof



not penetrable by waterCompare water-repellent, water-resistant


mainly British a waterproof garment, esp a raincoat

verb (tr)

to make (a fabric, item of clothing, etc) waterproof
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for waterproof



1725, from water (n.1) + proof. The verb is first recorded 1843. Related: Waterproofed; waterproofing.

Online Etymology Dictionary, © 2010 Douglas Harper