[ waw-ter-proof, wot-er- ]
/ ˈwɔ tərˌpruf, ˈwɒt ər- /


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.

Origin of waterproof

First recorded in 1730–40; water + -proof

Related forms

wa·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 water-proofed

British Dictionary definitions for water-proofed


/ (ˈwɔːtəˌpruːf) /


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