Wiktionary
silver frost
n. (context meteorology colloquial English) A deposit of glaze on trees, shrubs, and other exposed objects during a fall of freezing precipitation; the product of an ice storm.
Usage examples of "silver frost".
Molly blinked and shut her eyes against the glare of a silver frost that covered everything.
The walls of the Hall had all been covered in sparkling silver frost, with hundreds of garlands of mistletoe and ivy crossing the starry black ceiling.
A fresh silver frost covered all the grass and sparkled on the ancient brickwork of the tower.