[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.

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

Related Words for waterproof

impermeable, impervious, airtight, sealed

Examples from the Web for waterproof

Contemporary Examples of waterproof

Historical Examples of waterproof

  • I remember shirts and waterproof boots were mentioned by Bagshaw.

    The Channings

    Mrs. Henry Wood

  • And it must be cased in waterproof, to keep it from getting wet and heavy.

    Boy Scouts Handbook

    Boy Scouts of America

  • Yes, sir, it is a sort of waterproof cloth, made with Indian rubber.

    Frank Fairlegh

    Frank E. Smedley

  • The troops had made up little tents with their waterproof sheets.

  • For the first time, I realized the virtue of his waterproof silk shirt.

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