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black ice

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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.
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Origin of black ice

An Americanism dating back to 1820–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for black ice

black ice

noun
  1. a thin transparent layer of new ice on a road or similar surface
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012