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hoarfrost

noun [U or C]
 
 
/ˈhɔː.frɒst/ US  /ˈhɔːr.frɑːst/

Definition

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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