frostwork

noun

1. (countable, uncountable)Any naturally occurring intricate pattern of ice crystals.

   “Frostwork keeps its place on the window within three feet of the stove all day in my chamber.”

2. (countable, uncountable)Any pattern that resembles a frost formation.

   “More delicate frostwork, this time in the form of hairlike needles of calcite, occurs near the Pearly Gates. Here, as in all caves under the jurisdiction of the National Park Service, you are asked not to touch or handle the cave formations.”