Hoarfrost

Pronunciation: /ˈhɔɹˈfɹɔst/

Hoarfrost (noun)

  1. A thin layer of white, icy crystals that forms on cold surfaces when water vapour in the air freezes.

Examples

  • Hoarfrost covered the branches in frosty white crystals.
  • The window showed hoarfrost, frosty white crystals on the glass.