waterproof
wa-ter-proof
noun
A garment, especially a coat, made from waterproof material.
"Grab your waterproof; it's raining heavily."
adjective
Not allowing water to pass through it; impervious to water.
"This jacket is completely waterproof."
verb
To make something resistant to or impervious to water.
"We need to waterproof the roof."
Thesaurus
Synonyms: raincoat, rainproof, waterproofed, tight