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waterproof

noun [C]
 
 
/ˈwɔː.tə.pruːf/ US  /ˈwɑː.t̬ɚ-/ mainly UK

Definition

a coat or other piece of clothing that keeps you dry because it does not allow water inCoats, jackets and cloaks
(Definition of waterproof noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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