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.