black ice

black ice (uncountable)

1. A smooth, barely visible, and dangerously slippery film of ice, usually over a dark surface, such as rock or pavement.

   Coordinate term: black frost

   • 1965 December 25, “Oregon Bus Crash Kills 12, Hurts 27”, in New York Times‎, page 30:

     He said the bus struck a patch of black ice, or freshly formed ice as yet invisible on the road surface, just after he had passed a trailer truck.

• freezing rain