[ waw-ter-proof, wot-er- ]
See synonyms for: waterproofwaterproofedwaterproofingwaterproofs on Thesaurus.com

  1. impervious to water.

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

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

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

verb (used with object)
  1. to make waterproof.

Origin of waterproof

First recorded in 1730–40; water + -proof

Other words from waterproof

  • wa·ter·proof·er, noun
  • wa·ter·proof·ness, noun

Words Nearby waterproof

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use waterproof in a sentence

British Dictionary definitions for waterproof


/ (ˈwɔːtəˌpruːf) /

  1. not penetrable by water: Compare water-repellent, water-resistant

  1. mainly British a waterproof garment, esp a raincoat

  1. 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