Englishfor English speakers
premium
Noun
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A premium is an amount of money paid for insurance.
He had to pay a higher premium after his house burnt down.
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Premium is something that high quality and in short supply.
We had to pay a premium price for a glass of water in the desert.
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A premium is a bonus or reward.
casing
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noun
the outermost covering of a pneumatic tire
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noun
the enclosing frame around a door or window opening
the casings had rotted away and had to be replaced
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noun
(= case)
the housing or outer covering of something
the clock has a walnut case