English

Definition of hoar frost noun from the Oxford Advanced Learner's Dictionary

 

hoar frost

 noun
noun
BrE BrE//ˈhɔː frɒst//
 
; NAmE NAmE//ˈhɔːr frɔːst//
 
[uncountable]
 
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a layer of small pieces of ice that look like white needles and that form on surfaces outside when temperatures are very low