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English definition of “hoarfrost”

hoarfrost

noun [U or C]     /ˈhɔː.frɒst/ US  /ˈhɔːr.frɑːst/
a white layer of pieces of ice like needles that forms on objects outside when it is very coldSnow and iceCold
(Definition of hoarfrost noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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