Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Origin: hoar 'gray, white' (11-20 centuries) (from Old English har) + frost

hoarfrost

 noun
     
Related topics: Nature
hoar‧frost [uncountable] formal
DN a thin layer of ice that forms on objects outside when it is very cold [= frost]:
A light hoarfrost covered the fields.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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