n.
  - a deposit of small white ice crystals formed on the ground or other surfaces when the temperature falls below freezing.
- a period of cold weather when frost forms.
v.
  - cover or be covered with or as if with frost; freeze.
- N. Amer. decorate with icing.
Phrase
  
    
      - degrees of frost
 Brit. degrees below freezing point.
 
  Derivative
  
  Etymology
  OE frost, forst, of Gmc origin; rel. to freeze.