noun. ice crystals forming a white deposit (especially on objects outside).
- water ice
- frost (English)
- frost (Old English (ca. 450-1100))
- hoar (English)
- hore (Middle English (1100-1500))
Example sentences of the word hoarfrost
1. Noun, singular or mass
Cold, clear weather can form the surface hoar (hoarfrost) atop the snowpack that, buried by subsequent storms, becomes a weak layer that could prompt a slab avalanche sometime down the line.