Longman Dictionary of Contemporary English homepage

Topic: NATURE

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

hoarfrost

noun
     
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.
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