Waterproof means that something does not let water through. This is important for things like raincoats and boots, so that you don't get wet when it rains. There are many different materials that can be made waterproof, such as rubber, plastic, and vinyl.
The material is waterproof.
Adjective: not allowing water to pass through.
Noun: a material that is waterproof.
The word "waterproof" comes from the combination of the words "water" and "proof".
The word "water" comes from the Old English word "wæter", which means "water".
The word "proof" comes from the Old English word "prūf", which means "test" or "trial".
The first recorded use of the word "waterproof" was in the 17th century.
Why is waterproof clothing important to a mountaineer?
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