Search Result for "black ice":
Wordnet 3.0

NOUN (1)

1. a thin coating of ice (as from freezing mist) on a road or sidewalk; nearly invisible but very hazardous; 



WordNet (r) 3.0 (2006):

black ice
    n 1: a thin coating of ice (as from freezing mist) on a road or
         sidewalk; nearly invisible but very hazardous