waterproof

adjective
wa·​ter·​proof | \ ˈwȯ-tər-ˌprüf How to pronounce waterproof (audio) , ˈwä-\

Definition of waterproof

 (Entry 1 of 3)

: impervious to water especially : covered or treated with a material (such as a solution of rubber) to prevent permeation by water

waterproof

noun

Definition of waterproof (Entry 2 of 3)

1 : a waterproof fabric
2 chiefly British : raincoat

waterproof

verb
waterproofed; waterproofing; waterproofs

Definition of waterproof (Entry 3 of 3)

transitive verb

: to make waterproof

Keep scrolling for more

Other Words from waterproof

Adjective

waterproofness noun

Verb

waterproofer noun

Synonyms for waterproof

Synonyms: Adjective

leakproof, waterproofed

Synonyms: Noun

mac (or mack) [British], mackintosh (also macintosh) [chiefly British], oilskin, raincoat, slicker

Visit the Thesaurus for More 

Examples of waterproof in a Sentence

Adjective

This suntan lotion is waterproof. luckily, my backpack is waterproof, so my clothes didn't get wet

Noun

remember your waterproof if you're walking around London in the winter

Verb

He waterproofed the deck by applying sealer to it.
See More

Recent Examples on the Web: Adjective

In New York, the waterproof bucket hat appeared on more than one stylish head, and there were umbrellas in impossibly bright hues. Vogue, "Survive Those April Showers by Stocking Up on the Right Rain Gear," 3 Apr. 2019 This jacket is lightweight and waterproof for activities in the mountains. James Lynch, Popular Mechanics, "The Best Rain Jackets for Keeping Dry," 8 Mar. 2019 The durable nylon canopy comes with a waterproof polyurethane coating that sheds rain and won’t break down under the sun’s rays. Kari Bodnarchuk, BostonGlobe.com, "Here, there, and everywhere," 23 May 2018 Her durable, lightweight and waterproof trunks and travel accessories were a hit with the 19th cenutury jet set. Sarah Bray, Town & Country, "Why Upper East Siders Are Carrying This Historical Handbag," 3 May 2017 In his funding campaign video, inventor Maxwell Cohen explains that the fabric sheet aimed at college students has a waterproof coating to preserve underneath layers. Olivia Rassow, ELLE Decor, "Crazy or Brilliant: Peel-Away Sheets," 18 Feb. 2014 It also should be used with a countertop made of a solid material like quartz (as opposed to butcher block or laminate) because the edge of the counter needs to be waterproof. Jessica Dailey, Good Housekeeping, "Sinks," 11 Feb. 2019 After last year's deluge on Derby weekend, Welsh and Bell have included several versions which are made of waterproof materials (bonus!). Kirby Adams, The Courier-Journal, "Why a custom made Kentucky Derby hat is 'special and elegant and a little decadent'," 15 Mar. 2018 The deals do include the first major drop for the newest (and waterproof) Kindle Paperwhite e-reader, which is down to $100 for its usual $130. Ars Staff, Ars Technica, "Dealmaster: A bunch of Amazon devices are back on sale today," 10 Dec. 2018

Recent Examples on the Web: Noun

Master of the Elements Gore has always rain-tested its stuff; these materials are certified waterproof, after all. Tim Newcomb, Popular Mechanics, "Inside the Futuristic Labs That Forge Gore-Tex," 28 Nov. 2016 Their adjustable earhooks wrap around your ear for a snug fit, while a waterproof coating protects them from sweat. Alexandria Haslam, PCWorld, "These massively popular Bluetooth sport headphones are only $17 today," 10 Oct. 2018 If smudges or raccoon eyes are your problem, on the other hand, Eyeko's new waterproof 'Yoga' formula, named for its flexible, ultra stretch fibers, provides serious heft without clumps. Jenna Rennert, Vogue, "5 New Black Mascaras You Need in Your Life This Fall," 17 Aug. 2018 The company is evaluating a cup made by U.K. startup Frugalpac, which says the inclusion of an easy-to-separate waterproof lining means the cup can be processed by regular recycling facilities. Saabira Chaudhuri, WSJ, "A New Target in the Fight Against Plastic: Paper Cups," 30 Oct. 2018 Lifeactiv gives you 10,000-mAh battery power in a slim case that’s dropproof, waterproof, and dustproof. Graham Averill, Outside Online, "Emergency Gear that Should Live in Your Daypack," 9 July 2018 Brings back great memories - a young boy - being a boy - keep up the awesome work Jessica — michael ferrari (@idesign_mcs) June 27, 2018 Other folks were actually more impressed by Ace's waterproof cast. Lisa Gutierrez, kansascity, "Jessica Simpson's 4-year-old goes flying through the air in pool video. Moms freak out," 27 June 2018 Here are 9 waterproof eyeliner that not even a level 100 Cancer would not cry off. Sable Yong, Allure, "The Best Waterproof and Cry-Proof Eyeliners, Reviewed by Allure's Resident Cancer Sign," 21 June 2018 The UE Boom 2 produces 360 degree sound and is both waterproof and shockproof, so it’s made to be used on the go. Jackie Goldstein, The Verge, "The UE Boom 2 is on sale for $75 today only," 15 June 2018

Recent Examples on the Web: Verb

The Tech Trench's long cut will make rain run off of you, and taped seams and waterproofing keep you dry. James Lynch, Popular Mechanics, "The Best Rain Jackets for Keeping Dry," 8 Mar. 2019 This bar cart is perfect for outdoor entertaining, thanks to Olympic MAXIMUM® Stain + Sealant in One, which waterproofs against rain (plus sangria spills, of course) and has color and fade protection. Good Housekeeping, "This Shipping Pallet Bar Cart Is So Easy You Can DIY It In a Weekend," 15 Aug. 2018 Raising the building — needed to put an end to flooding of the lower lever — or waterproofing it as is would cost between $800,000 and $850,000, according to Schenck. Steven Goode, Courant Community, "Riley Lumber Property Purchase In Sight," 14 July 2018 The crew then retrofitted the space with plywood and waterproofed it before installing the shell of the pool. Liz Stinson, Curbed, "Artist turns old camper trailer into a mobile swimming pool," 15 June 2018 The coal vaults needed to be waterproofed, and the floor in the main part of the apartment had to be excavated to create higher ceilings in the dining and living rooms. Ruth Bloomfield, WSJ, "How to Live Luxe—and With Light—in a Basement Home," 13 June 2018 But before calling a basement waterproofing contractor, try other remedies. Kevin Brasler, Philly.com, "Solve a wet basement by fixing the problem, not managing it," 1 May 2018 Seam-Tape Failure Seam sealing is an amazing process used to waterproof the tiny stitch holes in a jacket. Joe Jackson, Outside Online, "How to Tell When to Retire That Rain Shell," 30 Apr. 2018 The building, built around 1920, has TV security and intercom systems, and in recent years its facade was steam-cleaned, repointed and waterproofed. Rosalie R. Radomsky, New York Times, "Recent Commercial Real Estate Transactions," 6 Feb. 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'waterproof.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of waterproof

Adjective

1725, in the meaning defined above

Noun

1788, in the meaning defined at sense 1

Verb

1820, in the meaning defined above

Keep scrolling for more

Learn More about waterproof

Statistics for waterproof

Last Updated

19 Apr 2019

Look-up Popularity

Time Traveler for waterproof

The first known use of waterproof was in 1725

See more words from the same year

Keep scrolling for more

More Definitions for waterproof

waterproof

adjective

English Language Learners Definition of waterproof

 (Entry 1 of 2)

: designed to prevent water from entering or passing through
: designed so that water alone will not remove it

waterproof

verb

English Language Learners Definition of waterproof (Entry 2 of 2)

: to put a substance on (something) in order to make it waterproof

waterproof

adjective
wa·​ter·​proof | \ ˌwȯ-tər-ˈprüf How to pronounce waterproof (audio) , ˌwä-\

Kids Definition of waterproof

 (Entry 1 of 2)

: not letting water through a waterproof tent

waterproof

verb
waterproofed; waterproofing

Kids Definition of waterproof (Entry 2 of 2)

: to make something resistant to letting water through

Keep scrolling for more

Comments on waterproof

What made you want to look up waterproof? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

marked by a state of overwhelming emotion

Get Word of the Day daily email!

Test Your Vocabulary

Words from Greek and Latin Quiz

  • roman forum
  • Which of the following months comes from a Latin word for “ten”?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!