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English definition of “fur”

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fur

noun uk   /fɜːr/ us    /fɝː/

fur noun (HAIR)

B1 [C or U] the thick hair that covers the bodies of some animals, or the hair-covered skin(s) of animals, removed from their bodies: She stroked the rabbit's soft fur. "Is that real fur on your collar?" "Certainly not - I only wear fake fur." a fur coat Native Americans traded furs with early European settlers.
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fur noun (GREY SUBSTANCE)

[U] a hard pale grey substance that can form on the inside of water pipes, kettles, etc.

fur noun (TONGUE)

fur

verb [I] uk   /fɜːr/ us    /fɝː/ (-rr-)
If water pipes, kettles, etc. fur, a hard grey substance forms on the inside: Over the years, the pipes in our house have slowly furred (up). ( also fur up) If someone's arteries (= tubes that carry blood from your heart) fur, or something furs them, they become slightly blocked: Eating too much fat furs up your arteries which slows down the flow of blood.
(Definition of fur from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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