freezing rain
noun
                                
              
          
                                                      : rain that freezes upon contact with a surface (such as the ground)                                      
              
                             
But to Healy's surprise, a glaze of freezing rain began to appear on the windshield.— Jon Vara
Jon Vara
                                       This also explains why the stuff we call freezing rain … falls as a liquid but then turns to a sheet of ice when it strikes the pavement or a tree branch.— Frederick K. Lutgens et al.
Frederick K. Lutgens et al.
                         
              
                                                         compare hail entry 1, sleet entry 1, snow entry 1                                      
                
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  Merriam-Webster unabridged




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