Synonyms of 'waterproof'
raincoatDictionary, mac (British , informal) , anorak
Put on your waterproof, it's raining!
mac (British , informal)
oilskinsDictionary, oilies (informal)
He was wearing waterproofs over his clothes.
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Thesaurus for waterproof from the Collins English Thesaurus
Something which is waterproof does not let water pass through it.