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water butt
Definition
A water butt is a container that collects rainwater. It is usually made of plastic or metal and has a tap at the bottom so that you can get the water out. Water butts are a great way to save water, especially during the summer months when there is less rain.
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?