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waterproof
Definition
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.
How can the word be used?
The material is waterproof.
Different forms of the word
Adjective: not allowing water to pass through.
Noun: a material that is waterproof.
Etymology
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.
Question
Why is waterproof clothing important to a mountaineer?