hoarfrost

名词 hoarfrost:

1. ice crystals forming a white deposit (especially on objects outside)
   同义词：frost, hoar, rime

hoar.frost

n.（名词）
Frozen dew that forms a white coating on a surface.Also called white frost
白霜：露珠结冰后在物体表面形成的白膜也作 white frost