black ice

noun

1. a thin sheet of ice, as on a road surface, usually caused by freezing mist and creating hazardous driving conditions.

2. Oceanography.,  sea ice that is clear enough to show the color of the water underneath.

black ice

noun

1. a thin transparent layer of new ice on a road or similar surface

Word History and Origins

Origin of black ice¹

An Americanism dating back to 1820–30