hoarfrost
/ˈhɔrfrɔst/
noun
- A white layer of ice crystals that forms on surfaces when the temperature is below freezing and there is moisture in the air.
- Hoarfrost made the tree branches look like they were decorated with tiny diamonds.
- When we woke up, the grass was covered in a sparkling layer of hoarfrost.
- The car's windshield had a thick coating of hoarfrost that took ten minutes to scrape off.